What can be inferred about the “Great American Desert” mentioned in line 7

What can be inferred about the “Great American Desert” mentioned in line 7?
A. Many had settled there by the 1860’s. 

B. It was not originally assumed to be a fertile area. 

C. It was a popular place to raise cattle before the Civil War. 

D. It was not discovered until the late 1800’s.

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Chọn D