Which of the following is most true about pregnancy prevention programs for adolescents?
a. They are most effective when they are school-based and they contribute to reduced pregnancy by reducing sexual activity.
b. They are most effective when they are school-based and they contribute to reduced pregnancy by increasing contraceptive use.
c. They are most effective when they are community-based and they contribute to reduced pregnancy by reducing sexual activity.
d. They are most effective when they are community-based and they contribute to reduced pregnancy by increasing contraceptive use.