Which is an example of a dependent clause

1.brushing his hair

2.because Malia brought cookies

3.through the window

4.she listens to reggae

2.  because Malia brought cookies

Explanation:

It's a clause with a subject and verb, yet it is not a complete sentence because of the adverb at the beginning that signals it is a dependent clause.

you do this because a real teammate puts the team first