The lake near a small city has become polluted. one group blames the local factory for the pollution. the factory claims that non-point source pollution from the growing city population is to blame. which of these tests would not local citizens figure out if the pollution was from a point source or non-point source? a compare samples from different places around the lake. b observe the areas where water leaves the factory. c laboratory analysis to find out what pollutants are in the water. d examine the wildlife of the lake to see how it is affected by the pollution.