A mango was . . . . . . by Manju. A. eat B. ate C. eats D. eaten

The correct answer is D. eaten.

The sentence is in the passive voice, so the verb must be in the past participle form. The past participle of “eat” is “eaten.”

The other options are incorrect because they are not in the past participle form.

• “Eat” is the infinitive form of the verb.
• “Ate” is the simple past tense form of the verb.
• “Eats” is the present tense form of the verb.