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hard · LSAT Logical Reasoning

The sample is either lunar, terrestrial, or artificial. If lunar, it contains isotope X; if artificial, it contains polymer Y. It contains neither. Therefore it is terrestrial.

Which one of the following arguments is most similar in its pattern of reasoning to the argument above?

  1. A signal is solar, mechanical, or biological. Solar signals have a flare pattern and biological signals have amino acids. Neither feature appears, so the signal cannot be mechanical.
  2. A signal is solar, mechanical, or biological. A flare pattern indicates a solar signal; amino acids indicate a biological signal. Neither feature appears. Thus the signal is mechanical.
  3. A signal is solar, mechanical, or biological. Solar signals have a flare pattern; biological signals have amino acids. Neither feature appears. Thus the signal is mechanical.
  4. A signal may be solar, mechanical, biological, or artificial. Solar signals have a flare pattern; biological signals have amino acids. Neither feature appears. Thus the signal is mechanical.
  5. A signal is solar, mechanical, or biological. Solar signals have a flare pattern; biological signals have amino acids. No flare pattern appears, but amino acids were not tested. Thus the signal is mechanical.

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