-Methicillin Inhibits Cell Wall Production

-Methicillin inhibits cell wall production.Why does this make it an effective antibiotic?

A) The cell wall of human cells is not sensitive to methicillin
B) Human cells have a plasma membrane in addition to the cell wall that allows them to survive in the presence of methicillin
C) Human cells do not have cell walls
D) All humans have a gene giving methicillin resistance
E) Human cells and bacterial cells are completely different, so methicillin does not affect human cells