Final answer:
The least convincing statement regarding acupuncture's safety mentions the complications resulting from inadequate sterilization and improper treatment delivery, implying risks. Acupuncture involves skin penetration which, if done with unsterilized needles, can expose patients to pathogens.
Step-by-step explanation:
The statement that would be LEAST likely to convince an audience of acupuncture's safety is "Still, complications have resulted from inadequate sterilization of needles and from improper delivery of treatments." This statement suggests that there are risks associated with acupuncture due to potential improper practices. In contrast, the other statements highlight the general safety and minimal pain associated with the procedure or the rarity of reported complications.
To address how acupuncture could facilitate exposure to pathogens, it's important to understand that the technique involves breaking the skin with needles. If these needles are not properly sterilized, they can introduce bacteria or viruses into the body, potentially leading to infections. Comparing acupuncture to historical medical practices like bloodletting, which was eventually found to be harmful, encourages critical thinking about how medical practices evolve and are evaluated for safety and effectiveness.