Answer:
Answer is option C.
Mountain glaciers are the water reservoir that could always provide fresh water on earth.
Explanation:
Glacier, the largest fresh water reservoir on earth is an important component in the water cycle of earth. They are huge mass of ice formed over many years, where the accumulation of snow and ice exceeds ablation (melting and sublimation). About 69% of the world's fresh water is stored in glaciers. Glaciers are made from compressed snow, which is salt-free because it is formed from water vapor in the atmosphere. When the water evaporates, it left the salt behind. Also the pollution level of glaciers are very low compared to other water reservoirs like lakes, rivers, seas etc.
