The given sentence is correct as it is and no improvement is needed. Hence, option E is the correct response.

The error is in the third part. "Formality" is a noun. But we require an adjective for the word "estimates". Thus, "formal" should be written instead of "formality".

The error lies in the first part of the statement. The rest of the statement categorically talks about a plural subject, which is evident from the usage of helping verb 'are' in the third part and the use of plural verb form 'require' in the second part. Thus, 'is' in the first part needs to be replaced with 'are'.

To-infinitive is followed by the base form of the verb (cope). Hence, the correct answer is C.

Recoup means regain (something lost or expended).

Remit means cancel or refrain from exacting or inflicting (a debt or punishment).

Reskill means teach (a person) new skills.

Cope means to deal effectively with something difficult. Workers need to update their skillset or reskill themselves to meet the current requirements of the industries.

Hence, the correct answer is C.

Strain means a severe or excessive demand on the strength, resources, or abilities of someone or something.

Demands means the desire of consumers, clients, employers, etc. for a particular commodity, service, or other item.

Fatigue means extreme tiredness resulting from mental or physical exertion or illness.

"Fatigue" is suitable to describe people, not a system. "Strain" and "demand", however, are suitable for the given sentence as they aptly describe the pressure that is put on the transport system by the additional passengers. Hence, the correct answer is D.

Improve means to make or become better.

Alleviate means to make pain or problems less severe.

Upgrade means to raise (something) to a higher standard, in particular improve (equipment or machinery) by adding or replacing components.

The verb in blank should be something that can be applicable on the "product". Since products do not have "sufferings", alleviate is not suitable for the blank. A product, however, can be improved or upgraded. Hence, the correct answer is D.

The word "suddenly" shows that something unexpected happened. We know that Nancy was quiet. So, it would be startling to see her do something that is opposite of being quiet i.e. speak. ‘Smile’ is in its base form can be negated easily.

Hence, the correct answer is B.

The correct sequence is ABDC. Thus, the sentence after the rearrangement is,

The Jacob Diamond is branded as a nonviolent diamond, as it never sparked any war or brutality, and changed hands only twice in its history of existence and much bigger in size.

Hence, B is the right answer choice.

The correct sequence is ACBD.

Note that after the infinitive 'to' we need a verb in its base form and of the emboldened words, 'start' fits the  context. So, C will take the second place. Now following the rule of parallelism we need a gerund to match with 'saving' after and at the third place, which is best sufficed by B 'investing'. D is correct at its place to form the noun word 'sewing machine'. Thus, the sentence after the rearrangement is,

Whilst some women would consider the grant as a ‘launchpad’ to start a small business from saving and investing in an asset like a sewing machine to make and sell clothes.

Hence, D is the right answer choice.