Which of the following areas would most likely have the greatest amount of surface runoff?

low, flat plain

sandy beach

steep mountainside

V-shaped valley

Steep mountain side will most likely have the greatest amount of surface runoff. The correct option among all the options given in the question is the third option. Low flat plains will not have a good surface runoff as there is no angle of descent for the water. Valleys often get the runoff water from the steep mountains and so the valleys cannot be a good place for surface runoff either. Sandy beaches absorb water but they are not places for good water runoff.