Concept:Resurgent springs are natural outlets where underground water rises back to the surface, especially in karst regions.
Explanation:Limestone terrains contain many joints, cracks, and swallow holes that absorb rainwater and surface streams.
This water percolates downward and moves through underground caves and solution channels.
When an impermeable rock layer beneath the limestone blocks further downward movement, the water is forced sideways.
Eventually, it emerges at the surface as a resurgent spring, usually where the limestone meets a valley floor or an impervious rock boundary.
This process is typical of karst topography, not of rift valleys, glacial u-shaped valleys, or glaciated areas.
Answer:C. limestone areas