Which process can be explained by the kinetic-molecular theory

Which process can be explained by the kinetic-molecular theory?
a.

combustion

c.

condensation
b.

oxidation

d.

replacement reactions

Condensation. By lowering the temperature you are actually slowing the molecules down which are randomly moving in the gas phase. When they are slowed enough, their intermolecular forces, which couldn't operate earlier as they are short range and weak forces, can now operate properly, thereby converting the gas to liquid.