Change this sentence from PASSIVE to ACTIVE voice.
Over the course of the year, many mistakes were made by our crew.

Passive voice uses the object of an action as the subject. We made many mistakes in active voice because it uses the perpetrator of the action as the subject. Though the Many mistakes answer has changed some of the sentence structure, it does not use the acting person or entity as the subject. The Though mistakes were made option is an example of using both passive and active voice in a single sentence, rather than changing a passive sentence to an active sentence. This answer choice also adds previously unstated information, for which the question does not call. The If mistakes were made option combines passive and active voice in addition to changing the original sentence’s meaning.