B - Alejandro wrote the song that Millie hoped to play in the talent show.
To have an active voice the subject should come before the verb (Alejando wrote and Millie hoped) the other options had the predicate before the verb and had the action happening to them.
♥ Answer: D hook
A hook is the term for an opening that grabs the reader's attention.
The best answer in this scenario would be A.Revise her hypothesis and the retest it.Hope this helps, and have a marvelous day.