171. Ethylene oxide has a lower explosive limit of 2.0% and an upper explosive limit of 100% by volume in air. This means __________.

there is no possible ethylene oxide concentration in air which is too lean to burn
there is no possible ethylene oxide concentration in air which is too rich to burn
an ethylene oxide spill always results in an explosion
a 2.0% concentration of ethylene oxide in air would give a reading of 2.0% on a combustible gas indicator

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