BTG forum:-
It is ironical that a majority of employees of the automobile company "has voted against the resolution, a resolution that was supposedly created to benefit" these very employees.
(A) has voted against the resolution, a resolution that was supposedly created to benefit
(B) has voted against the resolution, which was supposedly created to benefit
(C) has voted against the resolution, supposedly created to benefit
(D) have voted against the resolution, a resolution which was supposedly created for the benefit of
(E) have voted against the resolution, a resolution that was supposedly created to benefit.