medium · LSAT Logical Reasoning

A city council member argues: "Since we installed additional streetlights in the North District, the crime rate there has fallen by 10%. To bring down crime in the South District, we therefore must install additional streetlights there as well."

Which one of the following, if true, most weakens the council member's argument?

  1. During the same months the lights went up, the North District also doubled its police patrols.
  2. The 10% decline in the North District accumulated only gradually over a span of three full years.
  3. A few North District residents have complained that the newly installed streetlights are too bright.
  4. The South District covers more square miles and contains far more individual streets than the North does, raising the cost.
  5. Crime fell even more sharply over the same period in a neighboring city that put up no new streetlights at all anywhere.

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