1if the molecules in a gas lose energy, they will —
a collide more frequently and slowly condense into a liquid.
b move closer together and change phase into a liquid
c start to bond together and change phase into a solid
d collide less frequently and slowly sublimate into a solid

If the molecules in a gas lose energy, they will move closer together and change phase into a liquid

Explanation:

Condensation is process where matter changes his states from one to another. In evaporation, matter changes from liquid to gas but when matter changes from gas to liquid is known as condensation. It exists in the form of heat.

The example of condensation of water drops outside the glass.  It happens when molecule become cool. Here molecule lose heat. Here it loses its temperature or heat and become slow down