How Are Sibling Relationships Related to Adolescent Pregnancy

How are sibling relationships related to adolescent pregnancy?

A) Sibling relationships have no relation to adolescent pregnancy making it either less or more likely in occurrence.
B) An adolescent boy is more likely to engage in unprotected sex if his older sister experienced adolescent pregnancy.
C) An adolescent girl is less likely to become pregnant if her older sister experienced adolescent pregnancy.
D) An adolescent girl is more likely to become pregnant if her older sister experienced adolescent pregnancy.