Interchange interrogative and assertive sentences:
Johncould be asincere boy.

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Isn't John a sincere boy?

Is John a sincere boy?

No change.

A & B both.

answer is D.

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Detailed Solution

Concept- Interrogative sentences are those that ask questions and end with a matter mark. Sentences that make an assertion are the ones that inform us.
We have been given an assertive sentence and that we need to interchange it with the interrogative sentences.
To convert any sentence into an interrogative, the verb should be placed first, followed by the topic so the thing. The verb in" the sentence that has been given to us is, ‘is’.
we can write the interrogative as, “Is John a sincere boy?”
The verb is followed by a negative word so as to form the interrogation negative.
Thus, we are able to write the second interrogative as, “Isn’t John a sincere boy?”
Hence, option 4 is the correct answer as both options A and B are correct.

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