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