I think it’s the first one. Electroplating means you put on a layer of metal on something.
A) Burning
Burning is a chemical reaction while the other three answers are physical reactions.
The answer is Hydrogyn bonding. It keeps the water molocules bonded together and in a liquid state, without it it'd be in a gashious state.
Physical change- evaporation , condensation
Chemical change- combustion , neutralization
