Trinkwalder, N. A Chef's Guide to Curing Common

Diseases. Renfro Books, 2019.
Which aspect of this source should make the reader question its credibility?
A. It was not written recently.
B. It is not published in a major city.
C. It is not clearly written by an authority.
D. It is a peer-reviewed journal.

The correct answer is C. It is not clearly written by an authority.