Which is a nonpoint source of pollution?
A. Tourists throw trash into the ocean.
B. A car mechanic pours oil on the ground.
C. Rain contains chemicals that seep into the ground.
D. A pipe dumps waste from a factory into a stream.

The answer would be C.

Explanation:

Because rain does not count as pollution.

A. Tourists throw trash into the ocean.

Explanation:

Excess fertilizers, herbicides and insecticides from agricultural lands and residential areas. Oil, grease and toxic chemicals from urban runoff and energy production. Sediment from improperly managed construction sites, crop and forest lands, and eroding stream banks.