Your Authors Point Out That Teenage Women Have a Greater

Your authors point out that teenage women have a greater chance of having problems during their pregnancy, labor, and delivery than pregnant women in their 20s. They suggest that this is mainly because

A) pregnant teenagers are more likely to be economically disadvantaged and lack good prenatal care.
B) pregnant teenagers are more likely to smoke cigarettes during pregnancy.
C) pregnant teenagers are more likely to drink alcohol during pregnancy.
D) pregnant teenagers are less likely to get adequate sleep and rest during pregnancy.