Which of the Following Explains Why One Major Scientific Discovery

Which of the following explains why one major scientific discovery would have limited the number of deaths from the 1918 flu epidemic?

A) antiviral medications that would have treated secondary bacterial infections
B) antibiotics that would have limited the viruses' ability to replicate itself
C) antibiotics that would have treated secondary bacterial infections
D) All of the answers are correct.
E) None of the answers are correct.