A) As a group, children who are breastfed have higher IQs than those who are not, but the benefits of breastfeeding to an individual child varies with his or her genetics.
B) Breastfeeding does not have a significant effect on child IQ, because IQ is nearly completely determined by the child's genetics.
C) Mothers who breastfeed their infants have higher IQs than those who do not, so the higher IQs of breastfed children is probably related to genetics.
D) Breastfeeding raises the IQ of children regardless of their genetic makeup.
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