Mark the letter A, B, C or D on...

Câu hỏi: Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following question.
______, I decided to stop trading with them.

A. Despite of the fact that they were the biggest dealer

B.  Though being the biggest dealer

C.  Being the biggest dealer

D.  Even though they were the biggest dealer