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Which hazard does escaping fuel vapour present?

  • A.A fire and explosion risk in a confined space
  • B.None, since the quantity involved is small and disperses immediately into the surrounding atmosphere
  • C.Only smell
  • D.Accumulation of a flammable mixture, particularly in a garage or a confined space where it cannot disperse

Answer: A

Vapour accumulating in a garage is a genuine explosion hazard. The last option explains exactly that risk, which makes it a correct and more instructive version of the same answer. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The shared behaviour explains why these belong together and the differences explain why both exist.

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