Answer:
out-group homogeneity effect.
Step-by-step explanation:
Out-group homogeneity effect: The term out-group homogeneity effect is defined as an individual's perception or thinking pattern related to out-group members comparatively more similar to each other than the members of the in-group. It is also denoted as out-group homogeneity bias.
In other words, an individual sees an out-group as similar or homogeneous and in-group as varied or heterogeneous.
In the question above, the given statement best reflects the out-group homogeneity effect.