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Difficulty: Very hardPassage Assumptions and Underlying Premises

Read the passage given below carefully:

To mitigate the rapid accumulation of unsegregated solid waste in municipal landfills, several provincial urban local bodies have introduced a mandatory differential sanitation tariff. Under this policy framework, households that fail to source-segregate biodegradable organic waste from dry recyclables incur a progressive financial penalty added directly to their monthly property tax assessments. Policy proponents argue that imposing these monetary disincentives will rapidly alter household waste-sorting habits, thereby significantly expanding the volume of uncontaminated organic feedstock supplied to municipal biomethanation facilities. Consequently, municipal administrators project that this operational shift will curb landfill methane emissions and fulfill state-mandated circular economy targets within three years.

Which one of the following is a crucial underlying assumption without which the author's conclusion regarding the tariff regime cannot hold?

  1. A
    Biomethanation facilities in these urban centers currently possess unutilized processing capacity that requires additional organic feedstock.
  2. The financial penalty is set at a level high enough to outweigh the perceived effort and inconvenience households associate with sorting waste.Answer
  3. C
    Organic waste constitutes the single largest proportion by weight of all solid waste generated within provincial municipal jurisdictions.
  4. D
    Households will completely eliminate the generation of non-recyclable inorganic dry waste once the differential tariff takes effect.

Answer

The financial penalty is set at a level high enough to outweigh the perceived effort and inconvenience households associate with sorting waste.
The author concludes that financial penalties will alter sorting habits and expand organic feedstock delivery. For financial disincentives to drive behavioral change, the financial cost of non-compliance must exceed the effort or inconvenience of segregating waste. If the penalty were negligible relative to the effort required, households would pay the fine without changing their behavior, causing the conclusion to fail. Thus, this unstated premise is logically necessary.

Step-by-Step Solution

1
Identify the author's core premise and main conclusion.
Premise: Imposing a financial penalty on households for unsegregated waste creates a monetary disincentive. Conclusion: This disincentive will alter sorting habits and lead to meeting municipal organic waste targets.
An assumption is an unstated bridge that connects the premise directly to the conclusion.
2
Apply the Negation Test to the central assumption candidate.
Negate the candidate premise: 'The financial penalty is NOT high enough to outweigh the inconvenience of sorting.' If this negation is true, households would prefer paying the small penalty over taking the trouble to sort waste, rendering the financial disincentive ineffective in changing habits.
If negating a candidate statement causes the central argument to collapse, that statement is a logically necessary assumption.
3
Evaluate distractors against common critical reasoning fallacies.
The remaining choices represent plausible background inferences, external real-world facts, or extreme claims that are not logically mandatory for the conclusion to hold.
Distinction must be maintained between unstated logical assumptions and external context or tangential inferences.

Key Concept

Passage Assumptions and Underlying Premises
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Passage Assumptions and Underlying Premises

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