Two Sets of Identical Twins Are Given an Intelligence Test

Two sets of identical twins are given an intelligence test. One set of twins was reared by the same parents, while the second set of twins was separated at birth. Which set of twins will show highly similar intelligence test scores?

A) only the set of twins reared together
B) only the set of twins reared apart
C) Both sets of twins, but the score for the twins reared together will be more similar than the twins reared apart.
D) Neither set of twins will show a higher degree of similarity than two randomly chosen people.

Correct Answer:

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