. . . . . . Gandhiji . . . . . . in Rajkot?

Correct sentence: Did Gandhiji study in Rajkot?

The question refers to an action that happened in the past, so we need the Simple Past Tense.

In a Simple Past question, we use Did + subject + base form of the verb.

Here, the subject is Gandhiji and the main verb is study.

Did + Gandhiji + study → Did Gandhiji study in Rajkot?

Notice that after did, we always use the base form of the verb. Therefore, we say “did study”, not “did studied.”

Option A: When, studied — Incorrect. “When” does not fit the required question structure, and “studied” cannot be used after “did.”

Option B: Did, study — Correct. “Did” is the past auxiliary verb, and “study” is the base form of the main verb.

Option C: Was, study — Incorrect. “Was” is not used to form a Simple Past question with the main verb “study.”

Option D: Does, studied — Incorrect. “Does” is used for the present tense, while “studied” is a past-tense form.

Grammar Rule: Did + Subject + V₁ (base form) + ...?

Therefore, the correct answer is Option B: Did, study.