In sociology, a stereotype is a generalized belief about a group, assigning specific characteristics to all members, often ignoring individual differences or contradictory evidence.
Let's examine each option to determine which is NOT a stereotype:
Group C is lazy. This is a stereotype, attributing laziness to all members of Group C, disregarding individual variation.
Tribe A is irrational. This is also a stereotype, assigning irrationality to the entire tribe, overlooking potential rationality among its members.
She is a brave person. This describes an individual trait (bravery) of a specific person, not a generalized group characteristic. Therefore, it is NOT a stereotype. Stereotypes apply to groups, not individuals.
Community B is coward. This exemplifies stereotyping by attributing cowardice to an entire community, generalizing the trait to all its members.
Based on this analysis, the correct selection is: She is a brave person.