More than 70% of world's freshwater is contained in:

More than 70% of the world's freshwater is contained in polar ice. Polar ice refers to the large ice sheets that cover the polar regions, including Antarctica and Greenland. So, the correct answer is option D. Notice that the other options are not correct. Antarctica is a continent that is covered in ice, but it is not the primary location of the world's freshwater. Glaciers and mountains are locations where freshwater can be found, but they do not contain more than 70% of the world's freshwater. Greenland is an island that is covered in ice, but it is not the primary location of the world's freshwater.