Which of the Following Facts Is the Best Evidence in Favor

Multiple Choice

Which of the following facts is the best evidence in favor of the "g" factor in intelligence?

A) People who take an IQ test repeatedly generally get about the same score each time.
B) Parents who have high IQ scores generally have children with high IQ scores.
C) The mean IQ score for boys is the same as that for girls.
D) Scores on tests of specialized intellectual abilities are all positively correlated with one another.