Topic: Fill in the Blank,

Best Answer Explained in Below-:

The question focuses on the relationship between delaying retirement and the likelihood of developing Alzheimer's disease or other forms of dementia. Among the answer choices provided, "riskiness" appears to be misleading because it suggests a qualitative measure of risk rather than a quantitative evaluation.

However, the better fitting answers based on common language use would generally indicate a reduced probability of developing these conditions. "Low risk" and "less risk" indicate a decrease in susceptibility, which aligns more closely with research findings suggesting that engaging in mentally stimulating activities and maintaining social connections can contribute to brain health.

"Riskier," on the other hand, implies an increase in risk, which contradicts the premise. While "riskiness" denotes a degree of uncertainty regarding potential risks, it doesn't effectively address the question of vulnerability. Therefore, neither "riskiness" nor the other options present a suitable answer to the original statement.

In summary, while the phrasing may mislead, the essence is that delaying retirement is associated with a lower chance of dementia, which would ideally be reflected in choices emphasizing reduced risk rather than riskiness.