Final answer:
The evidence revealing the healing carbon fiber stickers as pseudoscience is that NASA clarified their spacesuits do not contain carbon fibers, debunking the seller's claims. This discredits the stickers and exemplifies how pseudoscience can be exposed through expert scrutiny.
Step-by-step explanation:
The piece of evidence that showed that claims about healing carbon fiber stickers were pseudoscience, rather than truth, is B. NASA explained that their spacesuits do not contain carbon fibers. This statement disproves the seller's claim, as there is no basis for the healing stickers' alleged technology being used in actual space equipment. Moreover, by providing a factual statement regarding the composition of spacesuits, NASA undermines the credibility of the stickers' purported benefits.
Claims such as those made by the sticker seller often rely on the assumed authority of high-tech imagery or associations with space technology to appear credible. However, when these claims are investigated by actual experts in the field, like NASA in this case, and shown to be factually incorrect or unsupported, it is a clear indication of pseudoscience.
Thus, demonstrating that the key technology or claim is not substantiated by evidence and does not correspond with established scientific knowledge is a powerful means of discerning pseudoscience from scientific fact.