Which Is the Best Example of a Selection Effect

Which is the best example of a selection effect?

A) Heterogamous marriages are more likely to end in divorce than are homogamous marriages.
B) The government establishes many rules and regulations surrounding marriage.
C) Married people enjoy more economic security than unmarried people.
D) Religious faith and practice are associated with higher marital happiness.
E) Healthier people are more likely to marry than are unhealthy people.