Which of the Following Is the Predominant Symptom of Primary

Which of the following is the predominant symptom of primary hypersomnolence disorder?

A) Repeated occurrences of dysphoric and well-remembered dreams that typically involve threats to one's life.
B) Recurrent periods of sleep or lapses into sleep during the day
C) Incomplete awakening from sleep, usually during first third of sleep
D) Frequent episodes of apnea while asleep