Answer :
Answer: B) Fatty deposits and other substances clog narrowed coronary vessels.
Explanation:
Aging brings changes in the heart muscles and the blood vessels. In old age heart beats slow and person experience labored breathing. This is because of the fatty deposition in the blood vessels which brings blood to the heart and takes away blood to other parts of the body. The fatty deposition is because of consumption of excess fat and cholesterol in food and because of lack of physical activity with age. These conditions can be responsible for coronary artery disease and heart stoke due to lack of smooth flow of blood in the blood vessels.