An implication of the concept of "overlapping distributions of ability" is that __________. A. Average differences between groups in specific performance domains are a myth. B. Average differences between groups in specific performance domains are typically much larger than people estimate. C. Within any group substantial variation typically exists in the performance of individual group members. D. Focusing on average differences between two groups obscures the large degree of overlap in performance among members of the groups. E. Both "C" and "D