The name for any matter in the water that renders it unfit for human use is which term?

• A. Pollution
• B. Purification
• C. Contamination
• D. Sedimentation

Answer: (C)

The concept tested is recognizing the term for the presence of undesired matter in water that makes it unsafe for use. Contamination describes exactly that—the water has been tainted by substances or organisms that render it unfit for human consumption or use. It includes chemicals, pathogens, or physical debris. Pollution is a broader term about harmful effects on the environment or the act of introducing contaminants, not the specific state of the water itself. Purification refers to the process of removing contaminants, and sedimentation is a treatment step where solids settle out. So, contamination is the best fit for the described condition.