Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
The student next to me kept chewing gum. That bothered me a lot.
A.A. The student next to me kept chewing gum bothering me a lot.
B.B. The student next to me kept chewing gum, that bothered me a lot.
C.C. The student next to me kept chewing gum bothered me a lot.
D.D. The student next to me kept chewing gum, which bothered me a lot.