Correct option (d) polar ice
More than 70% of word's fresh water is contained in Pola rice. Three-fourth surface of earth is occupied by oceans which contain 97.5% of total water. This is marine water with about 3.5% salt contents. Rest water, i.e.2.50% is fresh water which occurs on land. Most amount of this water (about 1.97%) occurs as frozen ice caps and glaciers and 0.5% fresh water occurs as ground water.