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 .

Jeff's ideas are because of his Percival bias.

Explanation:

Jeff has a predisposition bias against vegans because he associates them with a certain ind of habits that is the tree hugging and many such movements that he obviously has  a negative view about.

Thus, even when a person is vegan because they have no other choice but to be one they are still laying the same negative stereotypes on them.

This is the predisposed bias that he transfers onto another person who broadly fits that category in his head.

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