Question

Difficulty: HardParallel Flaw

We can conclude that the majority of modernist civic centers designed in the mid-twentieth century suffer from severe thermal regulation issues. After all, most of these civic centers incorporate extensive raw concrete facades, and it is well documented that most structures incorporating extensive raw concrete facades suffer from such thermal issues.

Which of the following arguments contains a flawed pattern of reasoning most similar to the one exhibited in the argument above?

  1. Most hybrid sedans currently on the market are equipped with regenerative braking systems. Therefore, most hybrid sedans require specialized mechanic certification to service, since the majority of vehicles equipped with regenerative braking systems require such certification.Answer
  2. B
    We can conclude that most commercial skyscrapers constructed recently feature a smart-grid foundation. After all, any building that features a smart-grid foundation is highly energy efficient, and most commercial skyscrapers are highly energy efficient.
  3. C
    Any candidate who completes the advanced leadership seminar develops strong negotiation skills. Thus, it is evident that candidates who possess strong negotiation skills must have completed the advanced leadership seminar.
  4. D
    Most of the individual subsidiaries within the Apex Corporation are highly profitable. As a result, the Apex Corporation as a whole must be considered a highly profitable enterprise.
  5. E
    If a patient receives the new synthetic antibiotic, their infection typically clears within three days. Hence, patients who do not receive the new synthetic antibiotic will not see their infections clear within three days.

Answer

The argument about hybrid sedans and regenerative braking systems.
The correct answer accurately replicates the 'chaining mosts' quantifier flaw seen in the stimulus. In the stimulus, the argument assumes that because most civic centers (A) have concrete facades (B), and most structures with concrete facades (B) have thermal issues (C), then most civic centers (A) must have thermal issues (C). The correct answer uses the exact same flawed reasoning: Most hybrid sedans (A) have regenerative braking (B), and most vehicles with regenerative braking (B) need certification (C), therefore most hybrid sedans (A) need certification (C). The order of the sentences is slightly varied, but the logical dependencies are identical.

Step-by-Step Solution

1
Abstract the logical structure of the stimulus.
Conclusion: Most A are C. Premise 1: Most A are B. Premise 2: Most B are C.
Identifying the formal structure allows for an objective comparison of reasoning patterns, independent of the subject matter.
2
Identify the specific logical flaw in the abstracted structure.
The flaw is Quantifier Overreach. Just because Most A are B, and Most B are C, it does not guarantee that the A's and C's overlap. (e.g., Most dogs are pets. Most pets are cats. Therefore, most dogs are cats. - Invalid).
Understanding why the stimulus is flawed ensures the correct answer choice is selected for the right structural reason.
3
Evaluate the answer choices to find the exact structural match.
The correct option abstract is: Premise 1: Most A are B. Conclusion: Most A are C. Premise 2: Most B are C. Despite a different ordering of premises and conclusion, the logical linkage and the flaw perfectly match the stimulus.
Parallel reasoning questions often vary the presentation order to test true structural understanding rather than superficial reading.

Key Concept

Parallel Flaw - Quantifier Overreach
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