Select from options: Continue writing the next sentence.

How to know if weight loss supplements really work
Review published clinical research.
You typically can find articles about published research online that has tested the weight loss claims of specific weight-loss supplements. Keep in mind that researchers define " clinically meaningful weight loss " as at least 5 percent of total body weight over the course of a year.

Options are:
[a]. Unfortunately, it may be difficult to find significant studies on the supplements in which you're interested. When you do find studies, look critically at who conducted the research and for what purpose.
[b]. Ask for an advance notice from a registered dietitian. A registered dietitian can advise you on whether you will be taking the supplements or not and may help you determine whether you will need an advance and what qualifies as a requirement.
[c]. Confirm that the claims have been published in journals in which information regarding weight and deficiencies is published, rather than found online. Try to lower your cholesterol.
[d]. You should avoid the following references as you'll look for testimonials. Only any of these references (or references that discuss weight loss) suggest that weight loss supplements have been taken in the past, at least.
Answer:
[a].