Final answer:
Gas pressure is caused by the kinetic energy of the gas particles, according to the kinetic theory of gases.
Step-by-step explanation:
The particles in a gas are in rapid motion and produce pressure through collisions with the surrounding material. Gas pressure is caused by the kinetic energy of the gas particles.
The kinetic theory of gases states that gas particles are always in motion and collide with each other and the walls of the container. These collisions result in the exertion of a force on the walls, which contributes to the overall pressure of the gas.
Therefore, the correct answer is C. Kinetic energy.