How does saturation, humidity, and relative humidity relate to water?

Relative humidity is just a special thing of the term relative saturation. Saturation might refer to vapor-liquid system where humidity aperres to be to the air-water system in particular. At any given temperature, there is an upper limit on how much water can evaporate into air. When this maximum amount of water is mixed with the air in the gas phase, the gas phase is said to be “saturated” with it.

Explanation:

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the answer is the last option or letter d)