Which of the following is the reason why groundwater is an important source of freshwater storage?
b. it is the only viable source of freshwater in some areas.
c. it is available in conditions of drought.
d. all of the above

Approximately 96% of the Earth's water is salt water in the oceans and seas. Therefore, only 4% of the Earth's water is fresh water.Groundwater is an important source of freshwater storage because  It is the only viable source of freshwater in some areas.

b. It is the only viable source of freshwater in some areas.