The Flynn effect is a trend demonstrating that
A) most people have an average increase of 15 IQ point over their lifetime.
B) most people have an average decrease of 15 IQ points over their lifetime.
C) the average IQ in developed nations such as the United States has increased about 15 points from 1932 to 1978.
D) the average IQ in the third-world nations of Africa and South America has increased about 15 points from 1932 to 1978.
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