Critical Reasoning

It is true of both men and women that those who
marry as young adults live longer than those who
never marry. This does not show that marriage causes
people to live longer, since, as compared with other
people of the same age, young adults who are about
to get married have fewer of the unhealthy habits that
can cause a person to have a shorter life, most
notably smoking and immoderate drinking of alcohol.
Which of the following, if true, most strengthens the
argument above?
(A) Marriage tends to cause people to engage less
regularly in sports that involve risk of bodily
harm.
(B) A married person who has an unhealthy habit is
more likely to give up that habit than a person
with the same habit who is unmarried.
(C) A person who smokes is much more likely than a
nonsmoker to marry a person who smokes at
the time of marriage, and the same is true for
people who drink alcohol immoderately.
(D) Among people who marry as young adults, most
of those who give up an unhealthy habit after
marriage do not resume the habit later in life.
(E) Among people who as young adults neither drink
alcohol immoderately nor smoke, those who
never marry live as long as those who marry.