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Passage: Rooftop solar water heaters installed in the town have cut household electricity bills sharply, and a unit pays for itself within four years. Even so, only a handful of households have installed one. The obstacle is not the price of the unit, which most households could meet over time, but the fact that the majority of families live in rented rooms and have no claim whatever on the roof above them. Which of the following best expresses the main point of the passage?

Competition practiceLogical / Critical
  • ARooftop solar water heaters pay for themselves within four years
  • BHouseholds in the town spend far too much of their income on electricity
  • COwners of buildings in the town should be required by law to fit solar water heaters
  • DWhat chiefly holds back rooftop solar water heaters in the town is not their price but the fact that most families have no claim on the roof above them

Step-by-Step Solution

The passage sets up a contrast - the units work and pay for themselves, yet few are installed - and then names the reason. That named reason is the point everything else supports. The four-year payback is a supporting detail, the claim about household spending is never made, and the passage recommends nothing to building owners.
Answer: D) What chiefly holds back rooftop solar water heaters in the town is not their price but the fact that most families have no claim on the roof above them

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