The correct answer is: A. Contains pathogenic bacteria.
Polluted water is water that contains harmful substances that can make people sick. These substances can come from a variety of sources, including sewage, industrial waste, and agricultural runoff. Polluted water can cause a variety of health problems, including diarrhea, cholera, typhoid fever, and dysentery. In severe cases, polluted water can even lead to death.
Pathogenic bacteria are bacteria that can cause disease. They are often found in sewage and other waste products. When these bacteria enter the water supply, they can cause a variety of health problems, including diarrhea, cholera, typhoid fever, and dysentery. In severe cases, pathogenic bacteria can even lead to death.
Option B is incorrect because it does not specify that the water is contaminated with harmful substances. Option C is incorrect because it does not specify that the water is contaminated with harmful substances. Option D is incorrect because it is not a complete answer.