A study of maternal smoking during pregnancy and the DD genotype revealed that
A) by itself, the DD genotype was related to impulsivity, overactivity, and oppositional behavior.
B) children whose mothers had smoked during pregnancy scored lower than children of nonsmokers in impulsivity.
C) children whose mothers had smoked during pregnancy scored lower than children of nonsmokers in overactivity.
D) children whose mothers had smoked during pregnancy scored higher than children of nonsmokers in impulsivity, overactivity, and oppositional behavior.
D
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