The correct answer is D. All the above.
When two elastic bodies collide, they exert a force on each other that causes them to deform. The deformation is temporary, and the bodies will return to their original shape after the collision. The amount of deformation depends on the strength of the collision and the elasticity of the bodies.
Immediately after the collision, the bodies come momentarily to rest. This is because the force of the collision has stopped the motion of the bodies. However, the bodies are still deformed, and they will begin to move again as they attempt to regain their original shape.
The bodies tend to compress each other till they are compressed maximum possible. This is because the force of the collision is trying to push the bodies together. The more elastic the bodies are, the more they will resist being compressed.
The bodies attempt to regain its original shape due to their elasticities. This is because the bodies are made of materials that have the property of elasticity. Elasticity is the ability of a material to return to its original shape after being deformed.
The phenomenon of collision of two elastic bodies takes place because of all of the above reasons.