The correct option is B A new found confidence in my skills was being felt by me.
The correct answer is ‘A new found confidence in my skills was being felt 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, ‘A newfound confidence in my skills’ + the singular verb, ‘was’, as the noun ‘confidence’ is singular + being, as the sentence in active voice is in the past continuous tense + past participle of the verb ‘feel’, which is ‘felt’ + by + the doer of the action, ‘me’.