Which of the following is not a method of purifying water?

Evaporation from a natural water body is not a water-purification method; it is part of the water cycle and leaves impurities behind in the source.

Reverse osmosis is a genuine method, forcing water through a membrane to strip out salts and contaminants.

UV radiation is a genuine method, killing microorganisms in the water.

Distillation is a genuine method, boiling water and condensing the pure vapour.

Natural evaporation is uncontrolled and does not deliver treated water to a user.

The vapour it releases, however, is the pure water that later falls as rain.