Correct option is A
The correct active form of the given sentence is (a) I was not ridiculing anybody.
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Active Voice- Active voice is a grammatical structure in which the subject of the sentence performs the action expressed by the verb.
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Passive Voice- Passive voice refers to a grammatical construction where the subject of a sentence undergoes an action rather than performing it. In passive voice sentences, the emphasis is on the recipient or object of the action.
Conversion rule:
Subject + was, were + verb + ing + anybody -> <- nobody + auxiliary verb (was, were) + being + past participle + by + subject.
The sentence in active voice should maintain the same tense and meaning as the original passive voice sentence.