问题详情

What does the former Labour MP mean by saying "social mobility created falters as well as risers" in Paragraph Four？

A．Social mobility was a "two-way street" and "a zero-sum game".

B．All students from comprehensive school can reach the Oxford by hard work.

C．School dropouts always work with lower payments.

D．Social mobility was a mirror to constant efforts from different people.

请帮忙给出正确答案和分析，谢谢！