Question

what is one characteristic of the coastal plains region?
rolling hills
piney woods
mostly flat
rewatch

Explanation:

The Coastal Plains region is known for its relatively flat terrain. Rolling hills are more characteristic of regions like the Piedmont, and piney woods are part of a specific sub - region within the Coastal Plains but not the defining characteristic of the entire Coastal Plains. The most defining physical characteristic of the Coastal Plains is that it is mostly flat.

Answer:

C. mostly flat (assuming the options are labeled A, B, C as rolling hills, piney woods, mostly flat respectively)