Which Statements About Racial Differences in Intelligence Is FALSE

Which statements about racial differences in intelligence is FALSE?

A) African Americans who have a higher percentage of European genes tend to have higher intelligence scores than African Americans with a lower percentage of European genes.
B) Biases in the testing situation might explain some, but not all, of the racial differences in intelligence scores.
C) Racial differences in intelligence scores plausibly can be accounted for by environmental factors.
D) Scientists have not isolated a genetic basis for racial differences in intelligence.