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i think it’s B. a hydrocarbon reacts with oxygen
if i’m correct, a combustion reaction is anything that’ll give a reaction

Answer:

A hydrocarbon reacts with oxygen

Explanation:

The other options are incorrect because:

  • oxygen is a reactant
  • water and carbon dioxide are products
  • the reaction doesn't involve ions

Other characteristics of combustion are the presence of: a flame, heat, ashes and smoke.