Advertisement: Which of the following is the most likely scientific explanation for why so many people report improvement after wearing this jewelry?

A.
The ions in the jewelry change the electric field around the body, improving blood flow.

B.
The company paid actors to answer questions about the jewelry.

C.
The ions in the jewelry improve energy flow through the body.

D.
Some people may feel improvement after a week because their body is healing naturally, without help from the ions.