Question

what factor could lead to a change in a persons blood type?
receiving a bone marrow transplant
having a heart attack
getting a blood transfusion

Explanation:

Blood type is determined by genetic factors in blood - forming cells. A bone marrow transplant replaces the recipient's bone marrow (which contains blood - forming stem cells) with that of the donor. Since the new stem cells produce blood cells with the donor's genetic characteristics, the blood type can change to match the donor's. A heart attack is a cardiovascular event related to the heart's blood supply and does not affect the genetic makeup of blood - forming cells, so it can't change blood type. A blood transfusion provides temporary blood, and the recipient's own blood - forming cells still produce blood of their original type, so it doesn't change the person's inherent blood type.

Answer:

A. receiving a bone marrow transplant