问题详情

The idea based on by the American educational system is that ______.
A．the results of the examination systematically prevent the students from going on to a higher level of study
B．the U.S. tries as much to screen people out as it is to keep them in
C．as many people as possible should have as much education as possible
D．the U.S. should have standardized examination请帮忙给出正确答案和分析，谢谢！