New Mexico has many attractions for visitors to the "Land of Enchantment." In the American southwest, you can see the Array Radio Astronomy Observatory—the world's largest radio-telescope array. If you travel to the north central region, you may visit the pueblos, where groups of Native Americans live today.

In which word or words in the paragraph above is there a capitalization error?
A.
American southwest
B.
Array Radio Astronomy Observatory
C.
Native Americans
D.
Land of Enchantment