A Scientist Discovers a Chemical in Certain Rocks That Kills

A scientist discovers a chemical in certain rocks that kills bacteria when it is mixed with sterile water in a test tube.She cannot market extracts that contain this chemical as a dietary supplement,because it ________.

A) has to receive a U.S.patent before the FDA will approve its use
B) must first undergo scientific testing to determine its effectiveness
C) does not contain dietary ingredients
D) contains more than one kind of natural material