WILL GIVE 20 POINTS IN NEXT QUESTION IF CORRECT

which sentence uses a coordinating conjunction to join two independent clauses?
A) Bill and Susan went to the lake yesterday.
B) After searching for over two hours, we finally found my mother's necklace.
C) Because the students did poorly on the test, the teacher decided to let them take it again.
D) Our trip to the mountains was full of beautiful sites, but the view from the top of the mountain was my favorite.