Of matter states that all particles of matter are in constant motion.

Answer

kinetic

Explanation

Matter is anything that occupies space and has mass. There are four states of matter, solids, liquids, gases and plasma. All this consist of small molecules that are in constant random motion. This is called kinetic theory of matter.

When these molecules are in motion they may collide. No energy is gained or lost during collision. The particle/molecules move in a constant linear motion.

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.