which water source may become polluted as it travels over land?\n○ ponds\n○ groundwater\n○ oceans\n○ runoff

Brief Explanations:

Runoff is water that travels over land. As it moves, it can pick up pollutants like chemicals, dirt, and waste from the land surface. Ponds are stationary bodies of water, groundwater is beneath the surface, and oceans are large water - bodies not mainly characterized by over - land travel for pollution in this context.

Answer:

D. runoff