Which of the following statements is true for gas particles? a. they move freely and combine with each other. b. they don’t move at all. c. they move slowly and in a structured pattern. d. they are constantly in motion and changing position.

In my opinion, the best answer among the choices listed above is option D. Gas particles are constantly in motion and changing position. It is the state where molecules has the highest amount of molecular kinetic energy. The molecules move freely and collide with each other.