Please see to my question!

Sorry i cann't type in chinese.

I am confused by the following question,please help me with the reasonable explanation.

Thank you all!

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 candidates.

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.

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.

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.

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

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

B

see the above explanation

补充一点，这种题是所谓的facts question

出现新元素的选项，统统可以排除

ACDE都可以这么排除

至于B为什么对，回来把答案套进去，就可以想通了

thank you all!!!