Points
what is a stereotype?
a. having a hostile attitude toward a group of people
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b. behaving in a negative or hostile manner toward people
c. feeling superior toward members of a certain group of people
d. a belief about the personal attributes of members of a group of
people
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D. A belief about the personal attributes of members of a group of people

Explanation:

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain