Which of the Following Statements Is Correct About Penicillin

Which of the following statements is correct about penicillin?

A) Penicillin is a by-product of metabolism found in specific Penicillium species that inhibits gram-positive bacterial growth.
B) Penicillin saved thousands of lives during WWI.
C) Fleming's discovery occurred when he deliberately put a mold in his bacterial cultures.
D) Fleming was trying to find a cure for deadly E.coli bacteria.
E) Commercial production of penicillin must be carried out in small flasks made of white oak.