medium · GMAT Verbal
Argument: "After a city installed LED streetlights, nighttime crime in the area dropped by 20%. The LED streetlights therefore reduced nighttime crime."
Which of the following would be most useful to determine in order to evaluate the argument?
- Whether neighboring cities use LED streetlights made by the same manufacturer.
- Whether the LED streetlights are more energy-efficient than the lights they replaced.
- Whether the residents of the area generally prefer the color temperature of LED lights over traditional sodium-vapor streetlights.
- Whether residents submitted most nighttime crime reports online or by telephone during that year.
- Whether the city also increased police patrols in the area during the same period the lights were installed.
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