What kind of character undergoes a significant change in the course of a story?

A dynamic character is one who experiences significant internal change throughout the story, whether in terms of their beliefs, personality, or understanding of the world around them. This evolution is often a result of the events they encounter and their interactions with other characters. Such characters typically face challenges or conflicts that prompt growth or transformation, making their journey compelling and relatable for readers.

In contrast, a static character remains unchanged despite the story's events, sticking to their original traits and beliefs. Round characters are complex and have depth, often displaying both strengths and weaknesses, but they may not necessarily experience a transformation. Flat characters, on the other hand, are usually one-dimensional and do not undergo any significant change or development. Therefore, the essence of a dynamic character lies in their ability to evolve, which is why this option is the most appropriate answer.