Answer:
A. III only
Step-by-step explanation:
Combustion reaction:
Combustion reaction is the one in which substance are burn in the presence of oxygen and yield carbon dioxide and water.
2C₃H₇OH + 9O₂—— 6CO₂ + 8H₂O
The given reaction is the combustion reaction.
Other options are incorrect because,
Reaction 1 is synthesis reaction.
2SO₂ + O₂ → 2SO₃
Synthesis reaction:
It is the reaction in which two or more simple substance react to give one or more complex product.
A + B → AB
Reaction 2 is decomposition reaction.
H₂O₂ → H₂O + O₂
Decomposition reaction:
It is the reaction in which one reactant is break down into two or more product.
AB → A + B