Choose the sentence that is written in active voice.

A. A serious accident was prevented on the highway by Roger's quick thinking.
B. Roger's quick thinking prevented a serious accident on the highway.
C. A serious accident was prevented on the highway.
D. A serious accident was prevented by Roger on the highway.

B is correct.

B is correct because active vioce lay emphasis on the and in option B, emphasis is been lay on the subject Roger

B. Roger's quick thinking prevented a serious accident on the highway.

The sentence written in active voice is: B. Roger's quick thinking prevented a serious accident on the highway.

The sentence written in active voice is B. "Roger's quick thinking prevented a serious accident on the highway."

To identify a sentence written in active voice, look for the subject of the sentence performing the action. In this case, "Roger's quick thinking" is the subject, and it is actively performing the action of preventing the serious accident.