Answer: D) Most of the adverse effects of acupuncture that have been reported do not derive from the procedure itself, but from proper application.
Step-by-step explanation:
The main idea of the paragraph is that the problem with acupuncture is not acupuncture or the procedure itself, but the inadequate way this is used by practitioners: "Still, complications have resulted from inadequate sterilization of needles and from improper delivery of treatments." The message of the text is that the adverse effects and the problems created by the use of acupuncture are related to "inadequate sterilization and improper delivery of treatments."