Question

most water pollution ultimately originates from where? underground in outer space on land in the atmosphere

Explanation:

Most water pollution comes from human activities on land, like industrial waste, agricultural runoff, and sewage, which then enter water bodies. Underground pollution is often a result of land - based pollution seeping down. Outer space and the atmosphere don't contribute to water pollution in a significant, direct way as a primary source.

Answer:

C. on land