Fact 1: Condensing means changing from a gas into a liquid by reducing heat energy.

Fact 2: Heat is the energy of moving molecules.

Given the two facts above, answer the question "condensing means changing from a gas into a liquid by reducing what?" with the following options: 
- moving molecules
 - Temperature
 - water
 - Evaporation
 - hydrogen and oxygen
 - petroleum
 - Water expanding
 - humidity


 

 moving molecules        