Question

in what form is a significant portion of the 3% freshwater inaccessible for human use? groundwater rivers and streams ice masses and glaciers

Explanation:

Most of Earth's freshwater is locked - up in ice masses and glaciers, making it inaccessible for human use currently. Groundwater and rivers/streams are more accessible sources of freshwater compared to ice masses and glaciers.

Answer:

C. ice masses and glaciers