OG 10th 194题，可不可以用one of who

194. Presenters at the seminar, one who is blind, will

demonstrate adaptive equipment that allows visually impaired people to use computers.

(A)  one who

(B)  one of them who

(C)  and one of them who

(D)  one of whom

(E)   one of which

Presenters 在这里是主格，one of whom中的whom是不是宾格形式，这里如果是who可不可以呢？

请大NN们抽空指点指点，先谢谢哦！

多谢你的指点。只有你回了我的问题，但是让我明白了也记住了。谢谢！