Which sentence includes a dependent clause? *
The students walked down the hallway and into the auditorium.
The class voted on their favorite project, and the winner received an award.
I will begin writing my essay once I have made an outline.
After practicing for many months, the drama club was ready to perform the play.
From Internet:
A dependent clause is a group of words that contains a subject and verb but does not express a complete thought. A dependent clause cannot be a sentence. Often a dependent clause is marked by a dependent marker word.
This should help you decide.