As the temperature of a substance decreases, the average kinetic energy of its particles

a- Remains the same
b- Decreases
c- Increases

Kinetic energy increases with increasing temperature and decreases with decreasing T.

Increases

b- Decreases

b- Decreases

Explanation:
The average kinetic energy of particles is directly related to their temperature. According to the kinetic theory of gases, temperature is a measure of the average kinetic energy of the particles in a substance. As the temperature of a substance decreases, the average kinetic energy of its particles also decreases. This is because temperature reflects the amount of thermal energy or heat present in a substance, and as the substance cools down, the particles slow down and have less kinetic energy.