The MSDS for propane gives it a health rating of 1, a flammability rating of 4, and a reactivity rating of 0. According to the MSDS, which best describes propane?

The flammability rating is 4, the highest rating given, so propane is highly flammable. Its health rating of 1 and reactivity rating of 0 do not indicate high toxicity or high reactivity. The best choice is highly flammable.

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