PT 65 S1 Q16

Activist: Any member of the city council ought either to vote against the ... ...

The conclusion of the activist’s argument follows logically if which one of the following is assumed?
(A) If all the members of the city council abstain in the vote on the proposal, the city’s voters will definitely decide in favor of the proposal.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Dec 2011 LSAT (PT 65): Logical Reasoning A