Correct Answer: Graduation was being completed by Rick last year.

Solution : The correct choice is the second option .

Passive voice is the voice in which the object experiences an action rather than the person who performs the action. Hence, the object in the active sentence becomes the subject in the passive voice.

The structure of the passive voice in the case of the past continuous tense is: "Singular object + was being + past participle form of the verb + 'by' followed by the agent of the action + time reference."

Therefore, the correct answer is: "Graduation was being completed by Rick last year."