The Parents of a Boy with Hemophilia a Want to Know

The parents of a boy with hemophilia A want to know why their son will receive factor replacement on an ongoing basis rather than when needed for bleeding episodes. They tell the nurse that the boy's grandfather, who had the same disease, received the drug only when he had bleeding. The nurse will give the parents which information about ongoing therapy?

A) It can reverse progression of the disease.
B) It is cheaper, because the amounts of the drug used are less.
C) It is used to minimize long-term damage to the joints.
D) It prevents the development of inhibitors.