Answer:
a) History of aortic valve replacement
Step-by-step explanation:
Infective endocarditis is a condition caused by the bacteria entering the blood. In is an infection in the blood and affects the heart valve or the endocardium.
The linings surrounding the interior surfaces of the heart chambers are called the endocardium.
Infective endocarditis is a serious medical condition and it can lead to damage of heart if not treated at time.
One of the major risk factor for infective endocarditis is aortic valve replacement. Aortic valve replacement makes the blood prone to be infected by bacteria most likely.
Other factors such as age, race and diabetes mellitus are not major risk factors for infective endocarditis but can be likely to affect the heart.
Thus the answer is
a) History of aortic valve replacement