Biomedical engineers at the sporting equipment convention, one who is wheelchair-bound, will demonstrate equipment that allows physically challenged athletes to compete effectively.

a)one who
b)one of them who
c)and one of them who
d)one of whom
e)one of which

[spoiler]OA = d[/spoiler]



Based on the "dirty trick" I asked "Who is in the wheel chair?" The answer is "He is..." Therfore the 'W' word used should be Who (and not whom).
Why is this rule not applied here?


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