medium · LSAT Logical Reasoning

Bacteria penetrate wooden cutting boards almost immediately, leaving the surface free of contamination. Therefore, wooden boards need only be wiped, not washed, to keep them from contaminating food cut on them.

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

  1. Bacteria that have sunk below a wooden board's surface do not later return to that surface.
  2. Washing a wooden board is the only method capable of killing bacteria that have penetrated it.
  3. Wiping a surface removes every kind of debris just as thoroughly as washing it does.
  4. Plastic cutting boards retain surface bacteria more readily than wooden boards do.
  5. Wooden boards never need to be washed for any purpose whatsoever.

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