Adoption Studies Reveal That __________

Multiple Choice

Adoption studies reveal that __________.

A) adopted children show a significant decline in IQ across middle childhood and adolescence, regardless of rearing conditions
B) children of low-IQ biological mothers adopted at birth by parents who are well above average in income and education do as well as children of high-IQ biological mothers placed in similar adoptive homes
C) genetic factors play a much greater role in IQ than environmental factors but have been overlooked in heritabilities, which typically underestimate genetic influences
D) children of low-IQ biological mothers adopted at birth by parents who are well above average in income and education score above average in IQ during the school years