Final answer:
Carlos is a flat character because he is uncomplicated and does not undergo significant development or change, representing specific traits or ideas. The correct answer is option D
Step-by-step explanation:
Carlos is described as a minor character who contrasts with the heroes of the story; unlike them, he is not willing to die for his principles and is willing to renounce what he believes in to save his life. This type of character would generally be considered a flat character, according to E.M. Forster's distinctions in Aspects of the Novel.
Flat characters represent specific traits or ideas and are relatively uncomplicated, which makes them easily summarizable and they do not undergo significant change or development throughout the story. They differ from round characters, who are more complex, undergo development and have the capacity to surprise readers in a believable way.
Since Carlos does not exhibit a significant change or complexity in his character, he is not a dynamic or round character. Furthermore, flat characters like Carlos might serve as a foil to the main characters or to highlight certain themes within a story by their steady traits contrasting with the changing attributes of dynamic characters.