The student next to me kept che...

Câu hỏi: The student next to me kept chewing gum. That bothered me a lot. 

A. The students next to me kept chewing gum, that bothered me a lot.

B. The students next to me kept chewing gum, which bothered me a lot.

C. The students next to me kept chewing gum, bothering me a lot.

D. The students next to me kept chewing gum bothered me a lot.