easy · 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 reduced the total number of hours the streetlights remained on each night.
- Citizens filed fewer complaints about poorly lit intersections after the LED streetlights were installed.
- 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 brighter and improved visibility on the roads.
- The new LED bulbs are expected to last five times longer than the old bulbs.
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