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.People think that Alexander Fleming discovered penicillin in 1928.
A.It was thought that Alexander Fleming discovered penicillin in 1928.
B.Alexander Fleming was thought to have discovered penicillin in 1928.
C.Penicillin is thought to have been discovered by Alexander Fleming in 1928.
D.Alexander Fleming discovered penicillin in 1928 is thought.