When air reaches saturation, its relative humidity will be

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The question asks about what relative humidity equals when air reaches saturation. 
Option a) 'about 25%': This would indicate a relatively dry air state, far from saturation. Relative humidity measures how much water vapor is in the air compared to how much it could hold at that temperature; at saturation it holds as much as possible, not a quarter of that capacity, so 25% is incorrect.
Option b) 'slightly less than 50%': While this value might occur under certain conditions, it does not represent saturation. Saturation means the air cannot hold any more water vapor at that temperature, so the RH would be higher than this range, not just under half. Therefore this choice is not correct.
Option c) '75%': This is closer to typical ambient humidity values but still does not reflect saturation. Relative humidity must reach 100% when the air cannot contain more water vapor, so 75% under saturation is inaccurate.
Option d) '100%': At the point of saturation, air cannot hold any more water vapor, meaning the relative humidity is at its maximum value of 100%. This indicates the air is fully saturated and any additional cooling or vapor addition would lead to condensation. Therefore this option correctly matches the definition of saturation.

GEOG121 -LEC Weather and Climate (XL) Pre-Course Quiz

When air reaches saturation, its relative humidity will be

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