medium · GMAT Verbal
City officials installed high-efficiency LED streetlights to reduce energy costs. Data from the first six months showed a 30% decrease in the city's electricity bill for street lighting. The officials concluded that the LED lights were solely responsible for the savings.
Which of the following, if true, most strengthens the conclusion?
- The city also cut the total number of hours that the streetlights stayed on each night to save additional power.
- Citizens filed noticeably fewer complaints about poorly lit intersections in the months after the LED streetlights were installed citywide.
- The cost per kilowatt-hour of electricity charged by the utility provider remained stable throughout the six-month period.
- Residents reported that the new LED lights were considerably brighter and substantially improved nighttime visibility on busy roads.
- The new LED bulbs are expected to last roughly five times longer than the conventional bulbs they replaced throughout the city.
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