This is known as Stereotyping. Judging someone on the basis of one's perception of the group to which the person belonges is called Stereotyping.
Many people have a tendency to make judgements on others' character traits based on their ethnic, religious, cultural or another kind of background. This type of judging is frowned upon by modern society.
<h3>What is Stereotyping?</h3>
When we judge someone on the basis of our perception of a group to which he or she belongs we’re using the shortcut called stereotyping.
For instance, “Married persons are more stable employees than single persons” is an example of stereotyping. To the degree that a stereotype is based on fact, it may produce accurate judgments. However, many stereotypes aren’t factual and distort out judgment.
Judging a person on the basis of one’s perception of a group to which he or she belongs.
Therefore, we can conclude that the correct option is B.
Your question is incomplete, but most probably your full question was:
Judging someone on the basis of one's perception of the group to which the person belonges is called
A) confirmation bias
B) stereotyping
C) framing effect
D) self-serving bias
E) bandwagon effect
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