Although Used for Many Years by Various Cultures,the Effectiveness (Or

Although used for many years by various cultures,the effectiveness (or ineffectiveness) of complementary and alternative medicine (CAM) therapies has only recently been of interest.What explanation by the nurse regarding this phenomenon is the most appropriate?

A) The Food and Drug Administration has not been supportive of this type of therapy.
B) Few have been subjected to rigorous clinical and scientific study.
C) The popularity of these therapies has only been recent.
D) Practitioners have not been suggesting them as treatments to their clients.