Concept:Pure water is water that is naturally clean and suitable for acts like ablution.
Explanation:Rain water is naturally distilled and remains pure.
Stream and river water are also natural sources unless visibly changed by impurity.
These are all acceptable for purification in Islamic practice.
Sewage water is contaminated with dirt, waste, and harmful substances.
It is considered
najis, meaning ritually impure, and unfit for use in worship.
Hence, sewage is the only option that is not a pure source.
Answer:D. Sewage