Which sentence uses active voice?

The bake sale was organized by the students
The students organized the bake sale
It was the students who organized the bake sale
It was decided that the students would organize a bake sale

The students organized the bake sale.

The sentence "The students organized the bake sale" uses active voice.

The sentence that uses active voice is: "The students organized the bake sale."

To identify the sentence that uses active voice, we need to look for a subject (the doer of the action) that performs the action directly on the object (the receiver of the action). In this case, "the students" is the subject and "organized" is the verb that shows the action being performed by the subject. Therefore, this sentence is in active voice.