As the water in a river moves downstream, the energy of the water moves sediment.

Kinetic energy.

Explanation:

The river picks up sediment and carriers it's downstream in different ways thus involves the flow of the kinetic energy. As the shape and the velocity of the river changes as it moves downwards and thus maintains its dynamic equilibrium. The river thus also provides a crucial pathway for the the flowage of marine lives as water is dynamic and very changing. As the kinetic energy of the molecules of water is due to the movement of the water at a constant speed. This also depends on the mass and direction of the flow. And has the potential to be converted into potential energy.

The answer is c) people evacuated but almost all returned