问题详情

A lot of cases of age discrimination are not found because
A．age discrimination law was just introduced recently.
B．other discriminated groups don"t sue except the whites.
C．age discrimination cases are in large quantity and it is difficult to detect all of them.
D．many discriminated people don"t sue and costs of a lawsuit outweigh potential benefits.请帮忙给出正确答案和分析，谢谢！