Answer: Option (A) is the correct answer.
Step-by-step explanation:
According to molecular kinetic theory, molecules of a gas collide in a randomly with each other and energy is neither gained or lost during these collisions.
As a result, molecules of a gas occupy almost negligible space of a container in which they are placed. Pressure is caused by the collisions and walls of the container on the gas molecules.
Therefore, we can conclude that the statement only gases show random motion of particles, is true according to the kinetic theory.