Why Does Microfertilization Reduce the Amount of Water Pollution from Farms

Why does microfertilization reduce the amount of water pollution from farms that employ this technique?

A) Since no fertilizer is used,there is no contamination by fertilizer from water runoff of the farm.
B) Microfertilization employs a biodegradable nitrogen source that does not pollute water sources.
C) Since only a small amount of fertilizer is used,less will end up in the local water supply.
D) With this technique,all of the fertilizer applied is used by the plant; thus there isn't a chance for it to end up in the water supply.
E) Microfertilization actually increases the amount of water pollution seen in local sources.