After mrs. chanski and her children had themselves to free samples of the cookies being promoted in the grocery store, she felt obligated to buy some, even though they seemed unreasonably expensive. her reaction best illustrates the significance of:
a) social facilitation. b) the reciprocity norm. c) the bystander effect. d) the just-world phenomenon.

Option B

Explanation:

The Reciprocity Norm:

This rule of social psychology says that, in many of the social situations whenever a person or some one does a favor for a person than that person feels obligated to payback that favor to that person.

Thus in the case of Mrs. Chanski and her children, the reciprocity norm applies where she felt obligated to return the favor by buying the cookies.

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