Which of the following sentences is written in active voice?

A

By April to her mother, that she would clean her room before going to see the movie was promised.

B

April promised her mother that she would clean her room before going to see the movie.

C

That she would clean her room before going to see the movie was promised by April to her mother.

D

To her mother, that she would clean her room before going to see the movie was promised by April.