Final answer:
Pathogens that lead to diseases in water often come from fecal matter in drinking water resources, originating from contaminated groundwater wells or untreated sewage. Therefore, correct option is B.
Step-by-step explanation:
Pathogens that lead to diseases in the water treatment system often originate from fecal matter that is mixed with drinking water resources. This can happen when groundwater wells are contaminated with fecal pathogens from sources such as pit latrines.
Moreover, untreated sewage contributes to the spread of waterborne diseases by allowing bacteria, viruses, protozoa, and intestinal parasites to enter the water supply. Proper sewage treatment is essential to remove these pathogens and prevent diseases such as typhoid, cholera, and diarrhea.
Disinfection methods, such as the use of chlorine, ozone, or ultraviolet light, in water treatment systems play a crucial role in eliminating these disease-causing microorganisms.