The teacher won't explain___makes his students so fascinated

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The teacher won't explain___makes his students so fascinated with his lessons.
A.what it is that B.that what it is C.what is it that D.that what is it

选A,名词性从句,C,D可以直接排除,从句应该用陈述句语序；The teacher won't explain (that)what it is that makes his students so fascinated with his lessons.这个是完整的句子,第一个that 可以省略,第二个省略的话表语从句主语不可以省略.
一年多没接触语法了,但是我觉得自信还是有点的,

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