Which of the following is true about earth's supplies of freshwater?
a. most liquid freshwater is stored in rivers and lakes.
b. groundwater is a significant reservoir of liquid freshwater.
c. liquid freshwater is about half of all the water on earth.
d. none of the above.

(B) Groundwater is a significant reservoir of liquid freshwater.

Explanation:

The ground water is one of the significant reservoir of the freshwater as the maximum amount of the fresh water are found under ground in the aquifers and soil moisture. The 98% of the fresh water is available underground on the surface of the earth.

The groundwater is basically define as the water which is found under the surface of the earth with 100% saturation. The groundwater is one of the significant and common source to all small towns and homes.

Therefore, Option (B) is correct.