Identical twins howard and harold both retired at age 66. howard liked to spend some of his leisure time solving challenging math and word puzzles, while harold preferred to watch tv. based on research findings, how does this relate to their respective risk of developing alzheimer’s disease?

Both Howard and Harold are at the risk of developing Alzheimer disease. But Harold has much greater risk because of his lifestyle.

Explanation:

The major risk of developing the Alzheimer disease is age. The likelihood of developing this disease will increase twice as much every 5 years beginning at age 65. Thus , the fact that Howard and Harold are 66 increases both their chances of developing this disease. Furthermore, the disease is also associated with other life threatening conditions such as high blood pressure and diabetes. However, a balanced nutritious diet, physical activities, and mentally stimulating games might help reduce the chances of getting the disease. Respectively,  Harold's lifestyle increases the chances of developing the Alzheimer disease to a greater extent as compared to Howard's lifestyle.

i agree d is most definitely correct!