Citizen of Mooresville: Mooresville’s current city council is having a

Summary in own words:
The citizen here does not like the current council. And suggests to vote against all current incumbents. He just makes an exception for the incumbent of his own neighbourhood, because she apparently has the necessary experience.
What has to be true, so that plan is most likely to succeed?

(A) at least some other voters in Mooresville do not make the same exception for their own incumbent in the upcoming election
Expl: True. If everyone would make the same exception for an incumbent of his/her own neighbourhood, nothing would change considering the council. Although it could be better if a majority of the other voters do not make the same exception...Keep it for now. Note that a majority includes at least some.
Potential Candidate.

(B) most of the eligible voters in Mooresville vote in the upcoming election
Expl: Just because most eligible people vote, does that not mean the plan will succeed. We want to vote against the current council (with one exception). If all the other voters vote for existing council members, nothing would change.
Incorrect.

(C) few of the incumbents on the Mooresville city council have run for reelection in previous elections
Expl: previous reelections do not play a role if we just want to vote against the existing council.
Incorrect.

(D) all of the seats on the Mooresville city council are filled by incumbents whose terms are expiring
Expl: According to the argument, several incumbents are running for reelection. -> Of course their terms are expiring! But that does not mean at all that the plan is more easier to succeed.
Incorrect.

(E) none of the challengers in the upcoming election for seats on Mooresville’s city council are better able to serve the interests of their neighborhoods than were the incumbents
Expl: If none of the challengers would be better than the current incumbents, people would not vote against the current incumbents. And our plan would not succeed. This is pretty much the opposite of what we seek.
Incorrect.

Although i do not find A a perfect candidate, it is the best of the lot. Mark your answer then. A) it is.

I got it right by the process of elimination, but didn't got the what (A), exactly means. Can someone explain?

To understand what (A) means precisely, first take a step back to understand what the passage and question stem tell us:

The citizen speaking is clearly unhappy with the current members of the city council. She's planning on campaigning against every one of the incumbents up for reelection except the member representing her neighborhood.

This citizen claims that if everyone followed her example, the council's membership would change substantially.

If each citizen can ONLY vote for a city council representative from his or her own neighborhood, which answer choice must be true in order for the council’s membership to be changed substantially?

Now let's take a look at what (A) is saying:

The "exception" made by the citizen is that she will support the incumbent from her own neighborhood -- she just wants everyone ELSE to be voted off of the council.

Now, what would happen if all of the other voters made the same "exception" for the city councilperson representing their neighborhoods? Well, then everyone would be campaigning, and voting, for an incumbent! If everyone voted for an incumbent, there wouldn't be any change in the membership of the council.

(A) prevents this situation from happening, so (A) must be true to "substantially change the council's membership".

I hope that helps!

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