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Difficulty: MediumPassage Assumptions and Underlying Premises

Read the following passage carefully:

"Despite significant government subsidies for drip irrigation systems aimed at conserving groundwater in semi-arid agricultural zones, recent hydrological assessments reveal that regional aquifers continue to deplete rapidly. While individual farmers adopting micro-irrigation reduce water consumption per hectare, the aggregate consumption of agricultural water across these districts has unexpectedly escalated. This paradox occurs because the water saved per unit area incentivizes farmers to expand their overall irrigated acreage and shift toward high-value, water-intensive cash crops, rather than maintaining existing crop choices on fixed plots. Consequently, public funding for water-efficient technologies fails to achieve ecological preservation unless accompanied by stringent volumetric groundwater extraction caps and crop-zoning regulations."

Which one of the following is the most crucial assumption on which the author's argument rests?

  1. A
    Micro-irrigation technologies do not actually reduce water consumption on a per-hectare basis compared to flood irrigation.
  2. Farmers act primarily to maximize economic returns from their land rather than to limit total regional water consumption.Answer
  3. C
    Adopting drip irrigation automatically leads to higher long-term financial insolvency for smallholder farmers.
  4. D
    Technological innovation in agriculture inevitably causes ecological degradation regardless of regulatory policy.

Answer

The argument crucially assumes that farmers act primarily to maximize economic returns from their land rather than to limit overall regional water consumption.
The author argues that technological efficiency fails to preserve water because per-hectare savings encourage farmers to expand irrigated area and plant water-intensive crops. For this behavioral response to occur, the author must implicitly assume that farmers prioritize maximizing financial returns from their land assets over conserving the total volume of groundwater. Applying the negation test confirms this: if farmers prioritized water conservation above profit, efficiency gains would directly lower total consumption, invalidating the author's explanation of the paradox.

Step-by-Step Solution

1
Identify the author's main conclusion and supporting premise.
Conclusion: Subsidies for water-efficient technologies fail to achieve ecological preservation without extraction caps and zoning. Premise: Farmers use saved water per hectare to expand acreage and plant water-intensive crops.
An assumption is an unstated bridge that connects the supporting premises to the author's final conclusion.
2
Apply the Negation Test to candidate assumptions.
Negate the core assumption: 'Farmers do NOT act primarily to maximize economic returns, but instead prioritize limiting overall water usage.'
If negated, saved water would remain unextracted in the aquifer rather than being diverted to expanded acreage or high-value crops, causing the author's argument regarding the paradox to fall apart.
3
Select the option representing this indispensable unstated premise.
The statement regarding farmers prioritizing economic maximization over total water containment represents the required underlying premise.
Without this implicit behavior model, efficiency improvements would lead directly to conservation rather than expanded aggregate consumption.

Key Concept

Passage Assumptions and Underlying Premises
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Topics

Passage Assumptions and Underlying Premises

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