The most plausible explanation for the negative correlation between cigarette smoking and Alzheimer's disease is that
A) nonsmokers are likely to eat a healthier diet, and diet has been implicated in the development of Alzheimer's disease.
B) smokers are likely to eat a healthier diet, and diet has been implicated in the development of Alzheimer's disease.
C) nicotine combats the Alzheimer's disease process.
D) nonsmokers live longer, and are thus more likely to develop Alzheimer's disease, which appears in later life.

Question

Quizplus · Accepted Answer

Nonsmokers tend to live longer, increasing their chances of developing Alzheimer's, which is more common in older age.

The Most Plausible Explanation for the Negative Correlation Between Cigarette