At the moment dew formation starts on a cool night, the air:

must lose all water vapour

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must remain unsaturated

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must get mixed up with some other vapour

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must become saturated

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Solution

The correct option is D must become saturated
At the moment dew formation starts on a cool night, the air must become saturated.

Due to condensation, water droplets appears on thin, exposed objects. This happens in the morning or evening.

The exposed surface radiates its heat and cools. The rate of condensation of moisture is greater than the rate of evaporation to form water droplets.

Option D is correct.

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