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 first knew his partner in 2011.
A.Mr. Smith has known his partner since 2011.
B.Mr. Smith hasn’t known his partner before.
C.Mr. Smith hasn’t known his partner for 6 years.
D.Mr. Smith has known his partner since 6 years.