One Explanation Proposed in Your Textbook for Why Girls Get

One explanation proposed in your textbook for why girls get better grades than boys in math courses but lower scores on math achievement tests has to do with

A) girls' lack of confidence in their math ability due to gender stereotypes.
B) girls being likely to take easier math courses than boys.
C) math courses being more likely to focus on novel problem-solving skill and math achievement tests being more likely to involve math computation.
D) the left hemisphere of the brain maturing more rapidly in girls than in boys.