According to the context, the negative attitude of the principal towards Marta is an example of prejudice, and staying away from getting the scholarship jacket by making a special rule is an example of discrimination.
Discrimination means making a difference between people on the basis of classes, groups, religions, castes, etc. it is a kind of unfair treatment of human beings.
Prejudice and discrimination are interlinked with each other. Prejudice is having negative feelings towards a group or an individual and discrimination mean taking an action upon those feelings. In the provided context, the special rule is made by the principal so that she can stay away Marta from receiving the scholarship jacket.
Therefore, the principal's attitude towards Marta is a sign of prejudice and the special rule for staying away is a sign of discrimination.
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