Which sentence is written in active voice?

A.

The form should be given to Bill when it's complete and ready.

B.

The best class in the school finished the test in less than 10 minutes.

C.

All of the homework was turned in by the students at the end of the six weeks.

D.

Cheating is treated seriously by the teachers, who will suspend students.

B. The best class in the school finished the test in less than 10 minutes.

Explanation:

You can identify an active voice in a sentence if it contains a subject that reflects the intention of the verb. An active voice will usually begin with a subject in a sentence. In a sentence, an active voice contains a subject, verb, and object.

To further enhance your understanding, I will be citing a few examples. These examples are; I passed my English exams, Mary Jane wrote the poem, the vehicle hit the train, etc.

Option B is the answer because the subject "Class" does the action described by the verb "finished".