The given sentence is in active voice and is an assertive sentence. The sentence is in past simple tense.

The structures for active/passive voices are:

Active voice= Subject + V2+ object

Passive voice= Object+ was/were V3+ by + subject

So, with the help of the above instructions, we can convert the given sentence into passive voice: Eight villages in the state were visited by the central team to assess the damage to the crops.

Hence, option B is the correct answer.

The given sentence is an assertive sentence. The sentence is in present perfect tense.

The structures for active/passive voices are:

Active voice= Subject + has/have+ v3+ object

Passive voice= Object+ has/have+ been+ V3+ by + subject

So, with the help of the above instructions, we can convert the given sentence into passive voice: A ban on spitting in public has been introduced by the Indian government.

Hence, option A is the correct answer.

The given sentence is in active form of an assertive sentence. The sentence is in past indefinite tense.

The structures for active/passive voices are:

Active Voice: Subject + V2 + Object

Passive Voice: Object + was/were + Verb (V3 form) + by + Subject

So, with the help of the above instructions, we can convert the given sentence into passive voice: The flood victims were rescued by the disaster management team.

Hence, option C is the correct answer.

The given sentence is in active form of an assertive sentence. The sentence is in present simple tense.

Structure of active/passive voices are as follows :-

Active voice = Subject + V1+s/es+ object

Passive voice = Object+ is/am/are+ V3+ by + subject

So, with the help of the above instructions, we can convert the given sentence into passive voice: Dirty clothes are washed by the poor washerwoman from morning to evening.

Hence, option C is the correct answer.

The given sentence is in active form of an assertive sentence. The sentence is in present perfect tense.

The structures for active/passive voices are:

Active Voice: Subject + has/have + Verb (V3 form) + Object

Passive Voice: Object + has/have + been + Verb (V3 form) + by + Subject

So, with the help of the above instructions, we can convert the given sentence into passive voice: These carpets have been woven by the prisoners of this jail.

Hence, option C is the correct answer.

The given sentence is an optative one.

The rules for converting passive to active voice are as follows:

1. The given sentence is the passive voice of an optative sentence. An optative sentence expresses a wish or a desire.

2. The passive form of an optative sentence is 'May + Object + 3^rd form of the verb + by + Subject.

3. An optative sentence in active voice is in the form 'May + Subject + Verb + Object'. For example, May the World get peace and prosperity.

Therefore, the sentence in the active voice will be ‘May God bless you with good health!’.

Hence, option D is the correct answer.

The given sentence is in active form of an assertive sentence. The sentence is written using the modal in indefinite form.

The structures for active/passive voices are:

Active Voice: Subject + modal + V1 + Object

Passive Voice: Object + modal + be + Verb (V3 form) + by + Subject

So, with the help of the above instructions, we can convert the given sentence into passive voice: Vast valleys can be seen sloping into the distance.

Hence, option C is the correct answer.

The given sentence is the passive voice of the simple present tense.

The structures for active/passive voices are:

Passive Voice: Object+ is/am/are+ V3+ by + Subject.

Active Voice: Subject + V1+ Object

The rules for converting passive to active voice are as follows:

1. Identify the subject of the sentence - who is doing an action? Here, the subjects objected the unfair proposal.

2. Change the object (us) into subject (we).

3. 'This unfair proposal' becomes the object in the active voice.

4. The ‘to be’ form of the verb is converted to simple tense. In the given sentence, the verb in the passive voice is 'is objected', therefore, the verb in the active voice should be in simple present tense i.e. ‘object’.

Therefore, the sentence in the active voice will be ‘We object to this unfair proposal’. Hence, option A is the correct answer.

The given sentence is of the past tense and is in the active voice, as the form of the verb (‘agreed’) shows that its subject (‘they’) was doing something and was ‘active’.

It can be changed to the passive voice, where something can be done by the subject.

The structures for active/passive voices are:

Active Voice: Subject + V2 + object

Passive Voice: Object+ was/were + V3+ by + subject

In order to do that,

1. The object of the transitive verb in the active voice should become the subject of the verb in the Passive voice. Here, the object is hidden. Hence, we will use 'it' as the subject.

2. Add the appropriate form of the verb 'be' to the sentence and use the past participle of the verb. The given sentence is in the past tense. Therefore, 'agreed' is converted to ‘was agreed'.

3. Add a 'by' followed by the doer of the action.

Thus, the same sentence in the Passive voice is ‘It was agreed by them that the elections should be postponed’.

Hence, option C is the correct answer.

The given sentence is of the past tense and is in the Active voice, as the form of the verb (‘advised’) shows that its subject (‘the doctor’) was doing something and was ‘active’.

It can be changed to the Passive voice, where something can be done by the subject.

The structures for active/passive voices are:

Active Voice: Subject + V2 + object

Passive Voice: Object+ was/were + V3+ by + subject

In order to do that,

1. The object of the transitive verb in the active voice should become the subject of the verb in the Passive voice. (‘she’ becomes the subject in place of ‘the doctor’).

2. Add the appropriate form of the verb 'be' to the sentence and use the past participle of the verb. The given sentence is in the past tense. Therefore, 'advised' is converted to ‘was advised'.

3. Add a 'by' followed by the doer of the action.

Thus, the same sentence in the Passive voice is ‘She was advised a week’s rest by the doctor’.

Hence, option A is the correct answer.