Antiviral Drugs Are Often Difficult to Develop, Largely Because

Antiviral drugs are often difficult to develop, largely because

A) viruses are obligate intracellular parasites so the drugs must enter the host cell and often cause toxic side effects in order to destroy the virus.
B) viruses are more abundant in the body than bacterial cells.
C) viruses are much smaller than bacterial cells.
D) viruses are more pathogenic than bacterial cells.