medium · LSAT Logical Reasoning

Every time the temperature drops below freezing, the pipes in the old building burst. Therefore, the freezing temperature is the cause of the pipes bursting.

Which of the following, if true, most strengthens the argument?

  1. The building's owner has for several years intended to replace the aging plumbing with newer piping.
  2. The pipes are also known to burst on certain hot summer days when no freezing temperatures occur.
  3. When water turns to ice it expands, generating enormous pressure inside the narrow confines of a pipe.
  4. The structure was erected more than eighty years ago and its pipes have undergone no recent renovation.
  5. Pipes in several newer buildings nearby occasionally burst even during stretches of unusually mild weather.

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