Question

what do we call sources of pollutants that are moving? stationary mobile

Explanation:

To determine the correct term for sources of pollutants that are moving, we analyze the options: "Stationary" means not moving, while "Mobile" means capable of moving. Since the question asks for moving pollutant sources, "Mobile" is the appropriate term.

Answer:

B. Mobile (assuming the options are labeled, with "Mobile" being the correct choice for moving pollutant sources)