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 help 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.