Can not be D or B and A is not enough so C is right.
Convection is the transfer of heat by liquid.
Answer:
Tug of War
An object sinking in water
Kicking a ball
I heard that most of the time water found in watersheds aren’t usually clean nor safe for drinking, but i know that there are very few that are somewhat safe for drinking. It’s just not usually common to find clean and healthy watersheds though.