Please help ASAP due at 9:30 just one answer will help thank you!

A1 a 2 a 3 ooh lol i think that's it

Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood. 

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.