(a) 33%
(b) 67%
(c) 97%
(d) 0%

Ans : (c) 97 %

Explanation:
Total volume of water available on earth is 1386×10⁶ km³ out of which 1348 × 10⁶ km³ is contained in oceans and is saline. Only 2.5 percent of water is fresh water was and rest 97.5 percent is saline. Ground water is about 0.61% and lakes and rivers is about 0.01%.