The correct option is B have been deleted by me.
The correct answer is ‘have been deleted by me.’ This is because the in passive voice, the plural form of the helping verb, ‘have’ is used since the receiver ‘unwanted posts and pictures from the account’ is plural. It is followed by the ‘be’ verb form ‘been’, the past participle form of the main verb ‘delete’ which is, ‘deleted’, the preposition ‘by’ and the doer of the action ‘I’ which changes to the object pronoun ‘me’.