Final answer:
Christian and his companion are imprisoned by the people of Vanity Fair.
Step-by-step explanation:
In the book The Pilgrim's Progress, Christian and his companion face challenges as they attempt to make their way through Vanity Fair. They are imprisoned by the people of the fair, who represent the worldly temptations and distractions that can hinder one's spiritual journey. This serves as a metaphor for the difficulties and obstacles that believers may encounter when striving to remain faithful in a materialistic and secular world.