Answer:
C. a stereotype; discrimination
Explanation:
According to my research on different psychological terms, I can that Mr. Watson's belief that Martians are rude is an example of a stereotype. A stereotype is defined as widely known but oversimplified image or idea of a particular type of person or thing.
Mr. Watson's refusal to rent an apartment to a Martian family is an example of discrimination. Discrimination is defined as unfair or prejudicial treatment of different categories of people, based on race, age, or sex.
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