Which of the following is a dependent clause?
A) yesterday Luca tried out for the soccer team
B) Jessica rides her bike every day
C) I will see you later
D) because they went to school
D. A dependent clause is one in which it could not be its own sentence without causing a fragmental sentence. Think about it like this, if someone walked up to you and said all of those to you, because they went to school requires more information.