In View of the Evidence,the Widespread Practice of Taking Melatonin

In view of the evidence,the widespread practice of taking melatonin to promote sleep is

A) dangerous and should be stopped.
B) definitely a waste of time.
C) likely to be of no more than minor benefit.
D) almost certain to have major sleep benefits in most people.
E) almost certain to have major sleep benefits in people suffering from insomnia.