medium · LSAT Logical Reasoning

Manufacturer: Our new water filter removes more contaminants than any competing model. We know this because in our laboratory tests it produced the clearest water, and clearer water is necessarily purer water.

Which one of the following is an assumption required by the manufacturer's argument?

  1. Clarity of water is at least a partial indicator of how many contaminants the water still contains.
  2. The new filter removes every known contaminant from any water passed through it.
  3. Consumers care more about the visual clarity of their water than about its taste.
  4. No competing filter has ever been subjected to the same laboratory tests.
  5. Laboratory test conditions perfectly replicate the conditions of ordinary household use.

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