The Corn Belt can be considered to be a physical region. Thus option B is correct.
What is a physical region?
A physical region is one where the area of land is divided into the natural borders and ab example of this region is the interior plains of the US which can be the border of the Appalachians.
The corn belt is a flat region that is geographically diverse and has known boundaries etc. The region is considered a physical region.
Find out more information about the physical region.
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