easy · GRE Verbal Reasoning
Last year, the town of Alder Creek replaced the conventional streetlights along its main avenue with solar-powered models. Since the replacement, the town's monthly electricity bill has fallen by 15 percent. Town officials conclude that the new solar streetlights are responsible for the drop in the bill.
Which of the following, if true, most seriously weakens the officials' conclusion?
- The solar streetlights were considerably more expensive to install than conventional replacements would have been.
- Residents of Alder Creek have expressed strong approval of the appearance of the new solar streetlights.
- Around the time of the replacement, the town also installed a far more efficient heating system in city hall.
- A neighboring town that kept its conventional streetlights pays a higher monthly electricity bill than Alder Creek does.
- The new solar streetlights provide noticeably brighter illumination than the streetlights that they replaced.
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