Please help with this answer!

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The Correct choice is : D
if temperature is held constant, then they have same average kinetic Energy because there's no change in energy caused by transfer of heat or something.
Answer:
As long as the temperature is constant, the average force of each particle striking the surface will be the same. Because the area of the container has increased, there will be fewer of these collisions per unit area and the pressure will decrease.
If the temperature is increased the particles gain more kinetic energy or vibrate faster. This means that they move faster and take more space. If the temperature is decreased,it is the opposite. Particles move slower, because of less energy.