Respuesta :
The answer is C: To add supplemental information that explains the situation.
In the passage from "When Birds Get Flu", the author mentions about the study made by Dr. Dowell and his concern with avian infuenza. The author explains that this is a bird flu, what birds (poultry) this virus usually strikes and also informs that it is rare for humans to get sick because of the bird flu.
The purpose of the author in the passage is C. To add supplemental information that explains the situation.
Purpose of an author
It van be deduced that the excerpt from "When Birds Get Flu", was about the concern with avian infuenza.
In this case, the author explains that this is bird flu, and that the virus usually strikes and also informs that it is rare for humans to get sick.
Learn more about purpose on:
https://brainly.com/question/15632673