The word “let” is used to suggest, to propose or to allow something. Below are the rules for changing such sentences in indirect speech:

• Say/said to changes to propose/proposed; suggest/suggested.
• If the reporting verb has an object, then it is used with “to” after proposed/suggested.
• The inverted commas (“ “) used in is removed and “that” conjunction is used.
• “Should + verb (Ist form)” is used after subject of the reported verb.
• The words like, this, these, tomorrow, yesterday change to that, those, the next day, the previous day respectively.

The given sentence is an exclamatory sentence as there is an expression of certain emotions in the sentence. Therefore, we will apply the rules of exclamatory sentences in the given sentence while converting it into indirect speech:

• Said is changed to exclaimed admiringly as there is a sense of admiration in the sentence.
• Inverted commas (" ") are removed and that is used instead.
• The tense of the reported speech will change from simple present to simple past.
• Sign of exclamation (!) if given is removed and full stop is used.

Rules for changing the direct speech into indirect speech are given below:
The inverted commas (“ “) used in Direct Narration is removed in Indirect Narration and “that” conjunction is used.
If the reported speech is in YES/NO question form then if/whether is used before reported speech.
Present perfect changes to past perfect.
Below are the rules for changing the pronouns correctly:
Second person pronoun changes according to the object of reporting verb i.e 'you' will change into 'he'.
Hence, option A is the correct answer.

This is a direct narration of exclamatory sentence. We change such sentences in indirect narration using following rules:

• Said is changes to exclaimed/exclaimed with joy/exclaimed with sorrow/ exclaimed with grief/ confessed with regret/ shouted with applause/ cried out/ eagerly wished.
• If the reporting verb is in present or future tense, no changes are made to the verb/tense of the reported speech. In such cases, says to changes to tells/comments.
• Inverted commas (" ") are removed and that is used instead.
• The verb and tense of the reported speech changes accordingly.
• Sign of exclamation (!) if given is removed and full stop is used.
• The words like, this, these, tomorrow, yesterday change to that, those, the next day, the previous day respectively.

The speech is an interrogative sentence. The reporting verb "said" will be changed to "asked" as the reporting speech is an interrogative sentence. Inverted commas (" ") will be removed. As the reported speech is in the form of WH-Question (who/what/why/how/where/when/which etc), no conjunction will be used before the question word and the question word itself works as conjunction. The reported verb will be made assertive; i.e. it is kept in the order of subject + verb. The reported speech is in the present indefinite tense and it will be changed to the past indefinite tense. Also, the second person pronoun will be changed according to the object of the reporting speech i.e. 'you' will be changed to 'he'. Hence, option C is the correct answer.

This is an imperative sentence. In such sentences, order, request, advise or negative command is given. In negative command, the reported speech starts with Do not or Don't.
Rules for changing imperative sentences in indirect speech:

• Say/said to changes to order/ordered/command/commanded/request/requested/urge/urged/advise/advised/ask/asked/tell/told/suggest/suggested.
• Inverted commas (" ") is removed and to is used before the main verb.
• The pronoun of the reported speech changes accordingly.
• The words like kindly, please are removed.
• For negative command, inverted commas are removed and not + to + verb (first form) is used. For example, do not go changes to not to go.
• In negative commands, forbid/forbade + object + to + verb (first form) is also used.
• The words like, this, these, tomorrow, yesterday change to that, those, the next day, the previous day respectively.