Haley's parents bought her a used bicycle for her birthday. she was thrilled until she learned that her best friend received a brand-new bicycle for her birthday. haley's declining satisfaction illustratesa)relative deprivation. b)the adaptation-level phenomenon. c)the catharsis hypothesis. d)the behavior feedback effect. page 7

A) relative deprivation

Explanation:

The given example is of the relative deprivation principle of sociology.

The Theory of Relative Deprivation. Throughout sociology, the principle of relative deprivation is a concept of societal change and campaigns, whereby people act for social changes in order to gain something (for example, privileges, prestige, or wealth) that others have and that they also feel they should have the same. Here Haley is feeling deprived of brand new bicycle as has a used one.