The correct option is A A story is not being written by me.
The correct answer is ‘A story is not being written by me’. In the passive voice, the receiver of the action ‘a story’ appears first in the sentence. It is followed by the form of the ‘be’ verb ‘is’, the negative word ‘not’, the verb ‘being, the past participle form of ‘write’ which is ‘written’, the preposition ‘by’ and the doer ‘me’. The subject pronoun ‘I’ changes to object pronoun ‘me’ when we convert a sentence from active to passive voice.