Correct Answer: Option B

Explanation

If the gas is cooled, the temperature at which it will start to condense will be the distance between the liquid and vapour from the graph. Extrapolate to the y-axis(Temperature axis), you'll discover it's around 150\(^0\)C. 

The temperature at which water vapour in the air starts to condense is referred to as the dew point.However,condensation will occur when the water vapour in the air is cooled, changing from gas to liquid.

There is an explanation video available below.

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