Which Is the Best Summary Statement to Characterize the Heritability

Multiple Choice

Which is the best summary statement to characterize the heritability of intelligence?

A) Environmental factors only minimally affect intelligence.
B) Genetic factors only minimally affect intelligence.
C) Genetic factors account for about half of the variation in intelligence test scores among individuals.
D) Genetic factors account for about 90% of the variation in intelligence test scores among individuals.