Stevenson's Cross-Cultural Comparisons Suggest That, of the Following Factors, _____

Stevenson's cross-cultural comparisons suggest that, of the following factors, _____ contributes importantly to the achievement gap between U.S. and Asian students

A) Asian parents expect and demand better academic performances than U.S. parents do
B) parent-teacher cooperation is greater in Asian societies than in the U.S.
C) Asian classrooms are more "businesslike" than U.S. classrooms
D) parent-teacher cooperation is greater in Asian societies than in the U.S. and Asian classrooms are more "businesslike" than U.S. classrooms
E) all of these