Which Statement Best Describes Effective Treatment of Sleep Disorders

Which statement best describes effective treatment of sleep disorders?

A) Sleep medications are the most effective short- and long-term treatment for sleep disorders.
B) Sleep medications can be used for long periods of time to treat severe sleep disorders.
C) Cognitive-behavioral techniques are as effective as sleep medication in treating insomnia in the short term, but not in the long run.
D) Cognitive-behavioral techniques are as effective as sleep medication in treating insomnia, and they are more effective in the long run.
E) Unknown; researchers have yet to investigate and identify the best methods for treating sleep disorders.