Which of the Following Provides Evidence of Stereotype Threat

Which of the following provides evidence of stereotype threat?

A) IQ scores do not accurately predict income.
B) People work harder on tasks when they are rewarded for successes than they do when they are punished for failures.
C) When intelligence tests are culturally biased (e.g., when they include examples that are known only to particular cultural groups) , they tend to reinforce race-based stereotypes about intelligence.
D) Women perform worse than men on math tests when they believe that the test produces gender differences, but they perform the same as men when they believe that the test produces no gender differences.