Which of the following is NOT a possible explanation for the fact that more intelligent people tend to live longer, healthier lives?

a. Intelligence makes it easier to access more education, better jobs, and a healthier environment.

b. Intelligence encourages a more health-promoting lifestyle.

c. Intelligent people have slower reaction times, so are less likely to put themselves at risk.

d. Prenatal events or early childhood illnesses could influence both intelligence and health.