The correct answer is: A. went
The sentence “Every morning Gandhiji went for a walk” is in the simple past tense. This is because the sentence is describing a habitual action that Gandhiji did every morning. The simple past tense is used to describe actions that happened at a specific time in the past.
The other options are incorrect because they are not in the simple past tense. Option B, “is going,” is in the present continuous tense. Option C, “was going,” is in the past continuous tense. Option D, “gone,” is the past participle of the verb “to go.”
The past continuous tense is used to describe actions that were happening at a specific time in the past. The past participle is used to form the perfect tenses and the passive voice.