Answer: option is A.
Explanation: The thing that happens in a happens in the process of gravitational condensation is A "An object decreases in size due to the collision of materials".
Gravitational force is the force which attracts anything that has mass and pulls them down to the Earth.
It should be noted that there will be a reduction in the size when the water which is heated water changes its state from the liquid state to the gaseous state.
