Naia is a vegan. Jeff thinks that all vegans are "treehuggers" who choose to be vegan because they are protesting for animal rights. In Naia’s situation, however, she is vegan because she has many allergies, and she eats a vegan diet to avoid many of the food substances that can make her ill. She's not vegan for political reasons.
(a) Jeff’s preconceived ideas about Naia are an example of _____________.