Reviews of clinical studies involving patients who received true acupuncture, placebo acupuncture, or no acupuncture, found that:
A. Placebo acupuncture was slightly more effective than either no acupuncture or true acupuncture in relieving pain
B. True acupuncture was much less effective than placebo acupuncture or no acupuncture in relieving pain.
C. True acupuncture was slightly more effective than placebo acupuncture or no acupuncture in relieving pain
D. No acupuncture was slightly more effective than either placebo acupuncture or true acupuncture in relieving pain