Which one of the following is the correct direct form of the given sentence? Mohit asked where they had parked the car.

The correct answer is B. The reported sentence uses past perfect (had parked) after the past reporting verb asked, so the direct sentence must have a simple past in its question form. Working back: Where did they park the car? When we report a question, the question word stays, the auxiliary did disappears, and the simple past shifts to past perfect in indirect speech. That gives where they had parked the car, which matches the given sentence.

Why the others fail:

• A drops the auxiliary altogether. “Where they parked the car?” is not a valid English question, and the question mark is also wrong for a direct question introduced like this.
• C keeps the word order of a question (“had they parked”), but the past perfect in direct speech is not what the reported sentence signals. Backshift from simple past is the standard route.
• D is wrong because B is correct.

The core concept is narration (direct and indirect speech), specifically the tense backshift and the conversion of questions. This is a routine Prelims English item, and the same logic helps in Mains answers that quote officials or witnesses.

Trap: aspirants see “had parked” and assume the direct sentence must also have “had”. Always trace the tense back one step before choosing.