ANS:C - 1

The dryness fraction of dry steam is 1. Dry steam is defined as steam that contains no liquid water droplets, meaning it is completely vaporized. Therefore, its dryness fraction, which represents the ratio of the mass of dry steam to the total mass of the steam (dry steam + water droplets), is 1. In other words, dry steam consists entirely of vapor, with no liquid water present. So, its dryness fraction is 1, indicating complete dryness.