关于 assumption逻辑题目中的排他问题！

b1tch

怎么区别ASSUMPTION中的 排他 和 无关呢 ？！
例如 这一题
For-profit colleges serve far fewer students than either public or private non-profit colleges. At the same time, relative to non-profit colleges, for-profit colleges draw a disproportionate share of federal and state financial aid, such as tuition grants and guaranteed loans, for their students. It must be, then, that for-profit colleges enroll a greater proportion of financially disadvantaged students than do non-profit colleges.

The conclusion above depends on which of the following assumptions?
                A  Public non-profit colleges and private non-profit colleges enroll a similar proportion of financially disadvantaged students.
                B  For-profit colleges do not engage in fraudulent practices in helping their students obtain unneeded federal and state financial aid.
                C  The number of students receiving federal and state financial aid at for-profit colleges is greater than the number of students receiving federal and state financial aid at non-profit colleges.
                D   For-profit colleges are of similar educational quality as non-profit colleges.
                E   The majority of students at for-profit colleges do not default on repayment of their loans after they complete college.
这道题目中的 这个B 是对的 但是我选了D 认为 若他们相似 是不是就排除了 一个 能导致 这个 fund不同的他因呢 ？！作为 排他 的 defender assumption？
但是答案是 B  为什么呢？？

lw19903201

只说了教育相似 没有和financial 挂钩啊