Which of the following sentences contains a comma splice？

A.Nicole chose what she thought were the best answers to the questions， her grade did not reflect these choices.

B.The man with long legs is my brother.

C.I learned the song on the piano， but I chose to never play it.

D.all of the above

E.None of the above

正确答案：Nicole chose what she thought were the best answers to the questions， her grade did not reflect these choices.