A flammable gas will burn or potentially explode if it finds an ignition source. An ignition source can be any element that produces a spark or flame, not an open window or a nebulizer. Thus, the correct answer is A. ;
Flammable gas leaking from a cylinder will burn or explode if it finds an ignition source. An ignition source can be anything that produces a spark or flame. Therefore, the correct answer is A: an ignition source.
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