According to Kinetic Molecular Theory (KMT), which statement is TRUE?
A. The density of a gas is usually comparable to the density of solids.
B. The average kinetic energy of a particle is proportional to the temperature in degree Celsius.
C. The collisions of particles with one another are completely elastic.
D. A single particle does not move in a straight line.
E. At constant temperature, the pressure of a gas in a container will decrease if the volume of the container decreases.