The correct option is C was not being anticipated by me.
The correct answer is ‘was not being anticipated by me.’ This is because the subject pronoun ‘I’ in active voice changes to the object pronoun ‘me’ in passive voice. And, the negative sentence in passive voice follows the structure of, receiver, ‘such a big crowd’ + the singular verb, ‘was’, as the noun ‘crowd’ is singular + not + being, as the sentence in active voice is in the past continuous tense + past participle of the verb ‘anticipate’, which is ‘anticipated’ + by + the doer of the action, ‘me’.