What do antivirals like acyclovir and zidovudine commonly target in the body?

Antivirals are medications designed to target viral infections in the body, such as the ones mentioned in this question, acyclovir and zidovudine. Unlike antibiotics, which are used to treat bacterial infections, or antifungals, which are used to treat fungal infections, antivirals specifically target viruses and work to inhibit their growth and replication. Endocrine disorders, on the other hand, are conditions that affect the body's hormone-producing glands and are not related to viral infections. Therefore, the correct answer is C.