I picked B as well. If before the third party came into the picture, the split was 50-50, then after the 3rd party came in, none of the parties will have more than 50%.
Very bad way of putting things but hey, this is CR for you!

B for me

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B for me

This is a fun math-based problem.

Correct answer is option B.

Let's assume the two major parties each have 50 votes out of a total 100 votes. And we know that a third party will take some of the 50 votes of ONLY ONE of the parties leaving the votes of the other party intact. Thus, no party would (still) have more than 50% of the votes or more than 50 votes.

Cheers,
Der alte Fritz.
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+1 Kudos me - I'm half Irish, half Prussian.

I don't think this should be categorized as debatable OA. The answer is a clearcut B. A is close but upon close inspection, B comes out on top. This is a must be true question type.

In a political system with only two major parties, the entrance of a third-party candidate into an election race damages the chances of only one of the two major candidates. The third-party candidate always attracts some of the voters who might otherwise have voted for one of the two major candidates, but not voters who support the other candidate. Since a third-party candidacy affects the two major candidates unequally, for reasons neither of them has any control over, the practice is unfair and should not be allowed.

If the factual information in the passage above is true, which of the following can be most reliably inferred from it?

(A) If the political platform of the third party is a compromise position between that of the two major parties, the third party will draw its voters equally from the two major parties.

- Wrong because the author states that the third party affects the other two candidates unequally

(B) If, before the emergence of a third party, voters were divided equally between the two major parties, neither of the major parties is likely to capture much more than one-half of the vote.

- Not sure at first... 'The third-party candidate always attracts some of the voters who might otherwise have voted for one of the two major candidates'

Then, some usually means about 30% or less than a half. Therefore, this fits into the premise.

(C) A third-party candidate will not capture the votes of new voters who have never voted for candidates of either of the two major parties.

Out of scope

(D) The political stance of a third party will be more radical than that of either of the two major parties.

Out of scope

(E) The founders of a third party are likely to be a coalition consisting of former leaders of the two major parties.

Out of scope
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