In all areas of the world, groundwater is an important source of drinking water. however, in many areas, the groundwater is being polluted, mainly by nitrates. sometimes the groundwater is so polluted, it is no longer able to be used as drinking water. what is the most likely source of the nitrate pollutants?

a. use of organic fertilizers (manure) in farming
the abundance of apartment complexes in urban areas
litter in the form of plastic bottles and aluminum cans
too many weeds growing near bodies of water
b. the abundance of apartment complexes in urban areas
c. litter in the form of plastic bottles and aluminum cans
d. too many weeds growing near bodies of water