Attempts to balance the distribution of campaign funds available to legitimate political candidates, a contemporary goal of election reformers in several states,
has not notably diminished the disparities persisting between the best and worst fundraisers.
A. has not notably diminished the disparities persisting
B: has not been notable in diminishing the disparities that persist
C: has not made a notable diminution in the disparities that persist
D:
have not notably diminished the disparities that persist
E:
have not
been notable in a diminution of the disparities persisting
Taking the middleman out of the original sentence:
Attempts to balance the distribution [strike]of campaign funds available to legitimate political candidates, a contemporary goal of election reformers in several states[/strike],has not notably diminished the disparities persisting between the best and worst fundraisers.
=>
Attempts to balance the distribution
has not notably diminished the disparities persisting between the best and worst fundraisers.
Attempts = plural
Correct option : D