Final answer:
A stereotype related to social identity is treating all individuals from a particular group as having the same traits, which is option A. Stereotypes are harmful generalizations that ignore individual differences and can lead to prejudice and discrimination.
Step-by-step explanation:
Stereotypes are oversimplified generalizations about groups of people that do not take individual differences into account. An example of a stereotype associated with social identity would be A. Treating all individuals from a particular ethnic group as having the same personality traits. This is a negative generalization that fails to recognize the unique characteristics and experiences of individuals within that group.
Prejudice, on the other hand, is a negative attitude and feeling toward an individual based solely on one's membership in a particular social group. It can lead to biased treatment and discrimination, which are actions against a person that are unfair and based on their group membership. In-group bias can contribute to this phenomenon, as people prefer their own group and may discriminate against others. Education and positive interaction with diverse groups can help reduce stereotypes and prejudice.