One Evening, When He Couldn't Sleep, Mr

One evening, when he couldn't sleep, Mr. Bradley turned on the television and saw an infomercial for a new sleep aid. As a critical thinker, Mr. Bradley should be most cautious about this new product if

A) the product had been subjected to an experimental study and the scrutiny of a peer-review process.
B) the results of research connect the efficacy of the sleep-aid to other widely accepted scientific findings.
C) its makers discuss the scientific investigations that have compared it to other effective sleep aids rather than relying on testimonials of those with insomnia.
D) its makers provide statements from people who have used the product, who indicate that it is proven to work.