A Physician Has a Patient with an Abnormal Heart Sound

A physician has a patient with an abnormal heart sound.After running some tests,the doctor decides that the patient has a heart murmur but the condition is not severe enough to warrant open-heart surgery.What does the doctor think about to make this determination?

A) The amount of blood flowing backwards in the heart is not enough to strain the heart as it works harder to catch up.
B) The heart sounds are due to air moving through the system and cannot be removed via surgical techniques.
C) The amount of blood lost is easily replaced with a transfusion of extra blood.
D) A heart murmur cannot be corrected surgically even though artificial heart valves do exist.