Let's say that the mayor of a town always belongs to one of three political parties: X, Y, or Z. The town holds an election every year, voting either to keep the incumbent mayor (if that mayor runs for reelection) or to elect a new mayor.
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Whenever a major political scandal erupts before an election and voters blame the scandal on all parties about equally, virtually all incumbents, from whatever party, seeking reelection are returned to office.
(Scenario 1): According to this statement, if a major political scandal erupts before one of the annual elections and voters blame the scandal on all three parties about equally, then the incumbent mayor, if seeking reelection, will almost certainly win the election, regardless of the mayor's political party affiliation. In other words, even though the incumbent belongs to a party that is equally blamed for the scandal, the incumbent and his/her party do not suffer negative political consequences.
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However, when voters blame such a scandal on only one party, incumbents from that party are likely to be defeated by challengers from other parties.
(Scenario 2): If the current mayor belongs to Party X, and voters blame the scandal on Party X, the current mayor, if seeking reelection, is likely to be defeated by a challenger from Party Y or Party Z. In other words, when the incumbent's party is the ONLY party blamed, the incumbent and his/her party DO suffer negative political consequences.
Now on to the question stem:
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If the voters’ reactions are guided by a principle, which one of the following principles would best account for the contrast in reactions described above?
The "voters' reactions" are described in the first two sentences: scenario 1) when voters blame a pre-election scandal on all parties equally, the incumbent usually wins, and scenario 2) when voters blame a pre-election scandal on the party of the incumbent, the incumbent usually loses. If we are told that those reactions are guided by a principle, which principle would best account for the contrast in those reactions?
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(A) Whenever one incumbent is responsible for one major political scandal and another incumbent is responsible for another, the consequences for the two incumbents should be the same.
The argument in the passage does not discuss how the voters would react if one incumbent were responsible for one major scandal and another incumbent were responsible for another. Choice (A) can be eliminated.
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(B) When a major political scandal is blamed on incumbents from all parties, that judgment is more accurate than any judgment that incumbents from only on party are to blame.
We are looking for a principle that accounts for the contrast in the voters' reactions (scenario 1 vs scenario 2), and we don't care whether the judgment on which one reaction is based is more accurate than the judgment on which the other is based. Choice (B) can be eliminated.
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(C) Incumbents who are rightly blamed for a major political scandal should not seek reelection, but if they do, they should not be returned to office.
First, the passage does not consider whether incumbents blamed for a major political scandal should or should not seek reelection. Second, choice (C) only explains the voters' reaction in scenario 2 and does NOT explain the
contrast in those reactions. Choice (C) can be eliminated.
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(D) Major political scandals can practically always be blamed on incumbents, but whether those incumbents should be voted out of office depends on who their challengers are.
This statement does not align with the information in the passage. According to the passage, if incumbents (and hence their parties) are blamed for a pre-election scandal, those incumbents will most likely lose the election, regardless of "who their challengers are." Choice (D) can be eliminated.
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(E) When major political scandals are less the responsibility of individual incumbents than of the parties to which they belong, whatever party was responsible must be penalized when possible.
First, apply this principle to scenario 2 (the incumbent's party--Party X, for example--receives all of the blame): in that case, Party X can easily be penalized by voting for someone in Party Y or Party Z. Now, consider scenario 1 (for example, the incumbent belongs to Party X but Parties X, Y, and Z all receive equal blame): if we follow the principle in statement (E), we should penalize ALL parties. If we vote for someone in Party Y or Z, one of those parties is rewarded while party X is penalized. There is no way to penalize all parties equally since a member of one of the parties has to win. In that case, the voters might just stick with the default option (the incumbent). Thus, choice (E) is the best choice.