C. was composed
Feedback Sometimes we need to change a sentence from the Active Voice into the Passive Voice. We can also know a person who carries out the action. In this case we use the Passive Voice and form a sentence according to this rule: Subject - Be+ Past Participle - Preposition 'BY' - Agent (who or what carries out the action). In this sentence the action took place at a certain time in the past, so we use the Past Simple Passive.