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Assumption-SN. The correct answer choice is (A)
The stimulus concerns the attempt of pet-lovers to change the rules of a residential building. The conditional for changing the rules of a residential building is:
- "Rules Change → 10% Petition AND ONLY THEN Majority Vote."
[Technically correct: "Rules Change → Majority Vote → 10% Petition."]
In order to be defeated by a majority vote, however, the pet-lovers would first have had to obtain the required 10% of tenant signatures on their petition. Since you are asked to identify an assumption in the argument, you should focus on the fact that the argument neglects the possibility that the pet-lovers never got the required signatures, so a vote never occurred.
Answer choice (A): This is the correct answer choice. For the argument to make a conclusion about the outcome of a vote, the argument needs to assume that the vote was possible in the first place. Without 10% of tenant signatures, the vote would not have ever occurred.
Answer choice (B): The argument would definitely not presume that less than 10% of tenants signed the petition, because that would eliminate the possibility that a vote occurred. This choice is contrary to the argument, and incorrect.
Answer choice (C): Since only a simple majority seems required to vote down the proposal, the stimulus does not need to assume anything so drastic as the idea that 90% of tenants opposed changing the rules.
Answer choice (D): The stimulus would clearly not assume that 10% support is sufficient to ensure the adoption of a rule change, because the stimulus states that majority support is required. This choice is contrary to statements in the stimulus, and thus should be immediately eliminated.
Answer choice (E): The idea that a failure to obtain 10% of tenant signatures would ensure that a proposal would be voted down by a majority of tenants is immediately incompatible with the argument, which states that without 10% of tenant signatures, the proposal will never even be voted upon. This choice is somewhat contradictory to the stimulus, and is thus incorrect.