hard · LSAT Logical Reasoning

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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