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 in each of the following question.
Dr. Sales is a person______.

A. in that I don’t have much confidence

B. whom I don’t have much confidence in him.

C. in whom I don’t have much confidence.

D. I don’t have much confidence.