A popular women's magazine has an article about the health benefits of consuming calcium-rich foods. If the article's author has the credentials, , after his or her name, the article is likely to be a reliable source of nutrition information.

RDN (Registered dietitian nutritionists)

Explanation:

The RDN are the nutrition experts who are able to understand the science of nutrition and they provide the practical solutions for diet and nutrition related matters to the clients.

These experts can make changes in the diet as well as they can bring the positive aspects of the lifestyle.

These experts work on the schools, hospitals, fitness centers, food industry and food management services.

These are responsible for changing the nutritional status of people all over the world.

According to the given situation, the article having the information about health related benefits of calcium consumption in food must have credentials of a author who must be a registered dietitian nutritionists then the article can be considered as reliable source of information. As the author belongs to the same field to which the article has been written and thus the information can be acceptable.

the answer your looking for is c. : )