medium · LSAT Logical Reasoning

A government should fund a public project only if the project's benefits to society outweigh its costs. The proposed high-speed rail line would cost far less than the combined value of the commuting time it would save and the pollution it would prevent. The transit commissioner therefore concludes that the government should fund the rail line.

Which one of the following, if true, most strengthens the commissioner's argument?

  1. The estimate of commuting time saved assumes ridership levels the line is unlikely ever to reach.
  2. The cost estimate omits relocating a neighborhood that lies along the proposed rail route.
  3. The proposed line would be the fastest high-speed rail system in the country.
  4. Every publicly funded transportation project whose total social benefits exceed its total social costs has eventually proven overwhelmingly popular with voters throughout the region.
  5. The rail line would impose no significant costs on society beyond those already reflected in the comparison.

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