The best scientific explanation for why many people report improvement after wearing a certain jewelry is explained in option (A) some people may be experiencing the placebo effect.
The placebo effect occurs <em>when people report that they are experiencing physiological or psychological changes due to a product that they use even though the product actually doesn’t contain properties that should create these changes.</em> The placebo in this situation is the jewelry.
It is probably A. It's like when I take melatonin before bed - doctors say to take it like 4 hours before bed but I take it 1 hour before I fall asleep and it works lol