Mark the letter A, B,...

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
Mr. Smith is very interested in our plan. I spoke to him on the phone last night.

A. Mr. Smith is very interested in our plan to whom I spoke on the phone last night.

B. Mr. Smith, who is very interested in our plan, I spoke to on the phone last night.

C. Mr. Smith, who I spoke on the phone last night, is very interested in our plan.

D. Mr. Smith, to whom I spoke on the phone last night, is very interested in our plan.