When you burned copper, the product copper oxide appeared on the wire. Besides copper, the other reactant is
air
⇒ oxygen, O2.
Explain how you know it must be oxygen. Where did the oxygen come from?

Evaporation: this is when warmth from the sun causes water from oceans, lakes, streams, ice and soils to rise into the air and turn into water vapour (gas). water vapour droplets join together to make clouds! condensation: this is when water vapour in the air cools down and turns back into liquid water.

The answer is c fish