What Was the Controversy in the Book the Bell Curve

Multiple Choice

What was the controversy in the book The Bell Curve?

A) the idea that the average IQ scores have been increasing across generations
B) the idea that parents have a significant role in the development of their children's IQ
C) the idea that group differences in IQ may be due mainly to genetic factors
D) the idea that racial differences in IQ may be due to different environments