The following is not a combustion reaction

Which of the following is a combustion reaction ?

Which of the following is combustion reactions ?

a) What is combustion reaction ?

Which of the following does not involve a combustion reaction ?

The following is (are) endothermic reaction I. combustion of methane. II. Decomposition of water. III. Dehydrogenation of ethane to ethylene IV. Conversion of graphite to diamond

All combustion reactions are ----.