All of the following are major sources of nutrient pollution except
a. Agricultural activities
b. Fossil fuel usage by vehicles and industries
c. Storm water discharge into local waterways
d. Acid rain and ozone pollution
because the other activities are the major sources of pollution. For example.. burning of fossil fuels pollute the air, storm water is a polluted one & it makes the water ways to pollute and the last one is also a pollution which is already shown as pollution in it's sentence.
