Choose the corresponding passive voice of the sentence:Alexander Fleming discovered Penicillin, a

Choose the corresponding passive voice of the sentence:
Alexander Fleming discovered Penicillin, a type of antibiotic.

a

Penicillin, a type of antibiotic, were discovered by Alexander Fleming.

b

Penicillin, a type of antibiotic, was discovered by Alexander Fleming.

c

Penicillin, a type of antibiotic, was discovering by Alexander Fleming.

d

Penicillin, a type of antibiotic, was been discovering by Alexander Fleming.

e

N. D. A.

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