A client is scheduled to undergo percutaneous transluminal coronary angioplasty (PTCA). The nurse explains the procedure to the client. Which of the following statements by the nurse is most appropriate（）
A. "PTCA involves opening a blocked artery with an inflatable balloon located on the end of a catheter. "
B. "PTCA involves cutting away blockages with a special catheter. "
C. "PTCA involves passing a catheter through the coronary arteries to find blocked arteries. "
D. "PTCA involves inserting grafts to divert blood from blocked coronary arteries. "
