According to the second passage, David and Myra Sadker of the American University of Washington, D.C found that_____.

A. schoolboys and schoolgirls are treated equally in the classroom.

B. teachers often concentrate on boys' behavior and girls' manners.

C. boys are commented usefully whereas girls are paid attention to behavior.

D. girls are taught to be insecure, accommodating and illogical while boys are strong, unemotional, aggressive, and competitive.