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.