The correct option is A 0.0019%
Nearly 71% of the Earth's surface is covered with water. Out of this, 97.3% is salt water and only 2.7% is fresh water, that is, water that can be used for our daily needs. Of the 2.7% fresh water, 2% of fresh water is trapped in ice caps and 0.0019% is present in atmosphere as water vapour.