Answer:
C, - burning a candle
Explanation:
Chemical reaction occur when a substance combines together with another substance to give another new substance.
Chemical reactions are irreversible, except for further reactions. Some process involve heat while some requires heat.
The atoms are rearranged by a change of energy during chemical reactions.
Examples of chemical reactions
Burning wood
Souring milk
Digesting food
Burning of candle
Baking cake
Rusting of iron
Acid and base mixture
The other options are reversible, so that makes them a physical change except for option c which is burning of candle
