Final answer:
Janet's changed perception of Bryce's friendliness as insincere after learning about his prison sentence is an example of a perceptual set, where expectations influence perceptions.
Step-by-step explanation:
After hearing that Bryce had served a prison sentence, Janet's perception of his friendly behavior as insincere and manipulative best illustrates the impact of c) perceptual set. This phenomenon occurs when our expectations influence our perceptions, leading us to see what we expect rather than what is actually there. The perceptual set is a mental predisposition that deeply affects our interpretations and expectations of others, often based on prior beliefs or experiences.
Janet's changed perception of Bryce after learning about his prison sentence suggests that she is utilizing her pre-existing beliefs about people who have been in prison to interpret his friendly actions, which is an example of a perceptual set. Her assumption that his friendliness is now insincere and manipulative shows how her expectations have influenced her perception.