Viruses Cause More Illnesses on an Everyday Basis Than Do

Viruses cause more illnesses on an everyday basis than do bacteria.Why are there so few antiviral agents compared to antibacterial agents?

A) Viruses are a bigger problem in developing countries where they do not have the funds to develop antiviral drugs.
B) Since viruses are not living, there are no drugs that can stop their proliferation.
C) Viruses use functions of the host to replicate themselves, so achieving selective toxicity is difficult.
D) Viruses do not cause as many deadly diseases and therefore have not been targeted with antivirals.