According to the Minnesota Pollution Control agency water quality is usually exceptional high in the Northeast part of the state intends to degrade as you go to the South and Southwest some 40% of the lakes and streams are polluted with much of that censored in southern Minnesota in 6 far Southwestern Minnesota counties there are no lakes considered fishable and swimmable what is the most likely source of water pollution in the southern parts of Minnesota? A. agriculture
B. mercury in rain
C. Thermal Pollution
D. factories and industry

Option A Agriculture

Explanation: As we move towards the South and southwest some 40% of the lakes and streams are polluted this is because of the agricultural run off. The fertilizers and other pesticides leach from the soil into the water bodies which can pollute water to a great extent.

The fertilizers contains many elements which is good for plants when they leach into the water bodies they are harmful for aquatic life.

Example: Presence of mercury in fertilizers can harm the aquatic life and acts as toxins above the permissible limit.

This is the main reason the water their is very polluted and is not fishable and swimmable.

substitution is the answer in this case