The correct option is A were being taken by me
The correct answer is ‘were being taken by me.’ This is because the subject pronoun ‘I’ in active voice changes to object pronoun ‘me’ in passive voice. And, the sentence in passive voice follows the structure of, receiver, ‘deep breaths’ + the plural verb, ‘were’, as the noun ‘breaths’ is plural + being, as the sentence in active voice is in the past continuous tense + past participle of the verb ‘take’, which is ‘taken’ + by + the doer of the action, ‘me’.