Which Teaching Point by the Nurse Is Correct in Regards

Which teaching point by the nurse is correct in regards to antiviral therapy?

A) Antiviral drug therapy can be challenging because of how slowly viruses become resistant to the drugs.
B) They have a broad spectrum of activity.
C) It is difficult to administer adequate doses of medication to kill the virus without injuring normal cells.
D) They must be given one at a time because of the possibility of severe side effects.