Why Is It Necessarily the Case That the Mean IQ

Multiple Choice

Why is it necessarily the case that the mean IQ for boys is the same as that for girls?

A) There are no differences between the abilities of boys and the abilities of girls.
B) IQ scores depend entirely on education, which is the same for boys and for girls.
C) The authors of the test balanced out two types of questions to make the means the same for boys and girls.
D) Male psychologists are biased in favor of boys and female psychologists are biased in favor of girls.