Final answer:
Minor characters enrich the narrative by supporting the main characters and highlighting different aspects of the conflict or traits of the protagonists, often through contrast as a foil.
Step-by-step explanation:
The purpose of minor characters in a story is to c) enrich the narrative and take part in the action. These characters can support the protagonist or antagonist in their struggles, sometimes without direct contact with the main characters. Minor characters can showcase different aspects of the conflict or highlight traits of major characters. A specific type of minor character, called a foil, is instrumental in underscoring the attributes of main characters through contrast. Foils may act as a sidekick or provide contention, therefore revealing and enhancing the protagonist's qualities by comparison.