The degree of saturation is defined as the ratio of _____
(a) volume of water to total volume of voids
(b) volume of air voids to volume of total voids
(c) volume of air voids to volume of water
(d) volume of voids to total volume of the soil mass
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My question comes from Void Ratio, Porosity and Degree of Saturation in chapter Preliminary Definitions and Relationships of Geotechnical Engineering I