Regarding ethnicity and IQ scores, which of the following statements is TRUE?

a. IQ is a good predictor of later career success.
b. What psychologist Robert Sternberg calls practical intelligence may be seen by minority cultures as more important than analytic intelligence.
c. Studies that used actual blood grouping testing found significant correlations between ethnic ancestry and IQ scores.
d. Group differences in IQ scores are based on heredity, not on cultural and environmental differences.

b