Though presently there is no quantifiable way to determine the reaction ranges of various intelligence-related traits, research on environmental enrichment programs and adoption studies suggest that the ranges could be:
A) 7 to 10 IQ points
B) 4 to 6 IQ points.
C) 20 to 30 IQ points.
D) 15 to 20 IQ points.
Correct Answer:
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