The statement that best explains how the third-person limited point of view affects "The Secret Life of Walter Mitty" is:
"The third-person limited point of view helps readers understand Walter Mitty's thoughts and feelings, giving insight into his daydreams and challenges while keeping other characters' thoughts a mystery."
This choice accurately highlights how the narrative focuses on Mitty’s internal experiences while keeping the perspectives of other characters less accessible, which emphasizes his struggles and daydreams.