The response that best illustrates how character interactions with other characters can change the central idea of the novel "Front Desk" is:
Mia's belief about how people with money are always generous changes when she realizes Mr. Yao is not a nice person.
This interaction demonstrates how Mia's experiences and relationships with others shape her understanding of the world and contribute to the central themes of the story, such as the complexities of human behavior and the impact of socioeconomic status on people's actions.