Kiyoshi Planned to Take Over-The-Counter Melatonin Supplements in Order to Restore

Kiyoshi planned to take over-the-counter melatonin supplements in order to restore the 24-hour sleep-wake cycle that was typical before she began college.After reading her psychology textbook,Kiyoshi decided that:

A) she should refrain from taking the supplements because the long-term safety is unknown.
B) the supplements would be most effective if she were to take them on a long-term basis.
C) she should check and make sure her supplements meet the federal standards for quality.
D) she should check and make sure her supplements meet the federal standards for dosage.