The tendency to see members of out-groups as very similar to each other is called:

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The out-group homogeneity effect refers to the tendency to perceive members of out-groups as similar or homogeneous, while seeing members of one's own group as more diverse or varied. This can lead to stereotypes and prejudice towards the out-group, as well as an overgeneralization of traits or behaviors to all members of the group. A and B are different phenomena related to social psychology, while C refers to the tendency to attribute one's successes to internal factors and one's failures to external factors.

The Tendency to See Members of Out-Groups as Very Similar