Why Doesn't a ß-Lactam Antibiotic Prevent the Growth of New

Why doesn't a ß-lactam antibiotic prevent the growth of new host (human) cells?

A) The host cells are slowed down by the antibiotic but still grow faster than the bacteria.
B) The host cells are protected by a thick layer of cell-wall peptidoglycan.
C) Osmosis only occurs in bacterial cells,never in human or animal cells.
D) The antibiotic only harms bacterial cell walls;the host cells do not have cell walls.
E) Antibiotics slow host cell growth,but after the bacteria are dead and the antibiotics are removed,the host cells can grow again.