Question

which aspect determines a health sources credibility?
o the country of publication
o the authors credentials
o the age of the author
o the type of medium (online versus print)

Explanation:

The author's credentials, such as their education, professional experience in the health - related field, and any relevant certifications, are key in determining a health source's credibility. A person with proper qualifications is more likely to provide accurate and reliable health information compared to factors like the country of publication, author's age, or type of medium.

Answer:

the author's credentials