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...

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

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

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

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