On the average, married men are physically and psychologically healthier than unmarried men are. Why is that fact NOT sufficient evidence to conclude that marriage is good for men's health?

A) The studies are longitudinal instead of cross-sectional.
B) No one has asked the men themselves how they feel about marriage.
C) Married women are not known to be healthier than unmarried women.
D) It is a statement of a correlation.

Married Men

Men who are in a legal marital relationship, often accompanied by social, emotional, and financial commitments to a spouse.

Physical Health

The condition of one's body, including the absence of disease and the state of physical fitness and well-being.

Psychological Health

The state of mental well-being where individuals realize their own abilities, can cope with normal stresses of life, work productively, and are able to contribute to their community.