Concerning Risk Factors and Teenage Pregnancy,which of the Following Statements

Concerning risk factors and teenage pregnancy,which of the following statements is true:

A) The age at which an adolescent girl first becomes sexually active is not a risk factor.
B) Demographic and economic variables like parents' educational attainment, income level and family composition (single parent vs. two parent) are not risk factors.
C) Among teen girls who are from poor families, or families with relatively uneducated parents, pregnancy rates are higher.
D) Pregnancy rates are highest in mid-adolescence, specifically ages 15 to 17, making middle adolescence a risk factor.