Answer:
Option D. The temperature
Step-by-step explanation:
Average kinetic energy of a gas particle is temperature dependant this implies that an increase in temperature will cause the gas particles to gain more energy hence increasing the average kinetic energy. In contrast when a gas particle is allowed to cool(i.e decrease in temperature), the average kinetic energy of the gas particles will drop. So we can see that the average kinetic energy of gas is determined by the temperature.