Concept:Water pollution can spread diseases through contaminated drinking water.Explanation:Cholera is caused by the bacterium Vibrio cholerae, which spreads when human waste contaminates water bodies and people drink or use that polluted water.River blindness comes from the bite of infected blackflies, not from polluted water.Asthma is mainly linked to air pollution, not water pollution.Hepatitis B spreads through blood and body fluids, not contaminated water.Answer:C. Cholera