HELP REGARDING A QUESTION

I was doing CNS questions on uworld and came across a question regarding sleep disorders. Can anyone pls explain why is it the correct answer, i chat gpt’d it and got a different explanation. Im copy pasting the material since images are not allowed. Thank you.

A 6-year-old boy is brought to the office due to frequent nighttime awakenings. Several times a week over the past month, he has come to his parents' bed around 3 AM, frequently crying, appearing frightened, and saying that he became lost in a crowd and couldn't find his parents. Although he is comforted by their reassurance, he refuses to return to his room and eventually falls back asleep in their bed. The boy is about to start first grade at a new school. He is healthy and developmental milestones are normal. Examination shows no abnormalities. The sleep stage associated with this child's frightening experience is characterized by which of the following?

A. Increased duration in first third of the night (5%) B. Low-amplitude theta EEG waves (7%) C. Muscle paralysis (40%) D. Sleep spindles and K complexes on EEG (18%) E. Slow-wave sleep (delta EEG waves) (29%)