Is a plain the result of constructive forces, destructive forces, or both?
A plain is a result of both constructive and destructive forces.

A- Crustal deformation raises the land up, and weathering then flattens the raised area out.

B-A plain is a result of both constructive and destructive forces. Weathering keeps the plain flat over time, and deposition brings more soil and sediments in.

C- A plain is a result of constructive forces. Deposition brings in soil and sediments that spread out in a large flat area and build up large flat land.

D- A plain is a result of destructive forces. Weathering evenly wears the land down over time, which keeps the area wide and flat.