Which of the Following Statements Best Summarizes Current Knowledge of the Differences

Which of the following statements best summarizes current knowledge of the differences in average mental ability test scores (during adulthood) between persons who were breastfed as infants and persons who were not?

A) Persons who were breastfed as infants score higher on mental ability tests,and this is because the nutritional advantages of breast-feeding cause infants to grow up to be smarter.
B) Persons who were breastfed as infants score higher on mental ability tests,and this is because the mother/infant contact of breast-feeding causes infants to grow up to be smarter.
C) Persons who were breastfed as infants score higher on mental ability tests,and this is because smarter mothers are more likely both to breast-feed and also to have smarter children.
D) Persons who were breastfed as infants do not score any higher (or any lower) on mental ability tests.
E) Persons who were breastfed as infants actually score lower on mental ability tests.

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