An ad for a weight-loss supplement claims that people who use the supplement will lose 20 pounds in one month. This is based on a study conducted by the company. A statement in the fine print explains that the claims have not been evaluated by the Food and Drug Administration (FDA).

Which concern does this advertising raise?

If the supplement has not been evaluated by the FDA, it might not be safe.
Claims that are tested by many companies might still be biased.
Claims that show the dramatic results of the supplement cannot produce those results.
Claims that are tested only by the company selling the supplement are probably false.