The correct answer is D. Municipal wastewater treatment plant.
Explanation
The wastewater treatment is a set of processes that allow giving an adequate end to the wastewater of different practices including normal household use, agricultural practices, construction, livestock, washing, among others. In the case of wastewater from agricultural practices, the correct process for these waters is in a municipal wastewater treatment plant because there are specific processes to treat these waters and reuses or disposes of them properly, avoiding their discharge into rivers, groundwater, or seas producing pollution caused by the high load of agricultural chemicals they have. Therefore, the correct answer is D. Municipal wastewater treatment plant.