An adoptive twin study is conducted to examine the role of genetics and environment on sociability. Which result would lead to a conclusion that environmental factors are important in the development of this trait?
A) Identical twins reared together are more similar on the trait than are identical twins reared apart.
B) Identical twins reared together are no more similar on the trait than are identical twins reared apart.
C) Identical twins reared together are less similar on the trait than are identical twins reared apart.
D) Identical twins reared apart are more similar on the trait than are fraternal twins reared apart.
Correct Answer:
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