Final answer:
The passage is a nonargument - analogy that uses analogy to compare the appearance of a turkey vulture's head to that of a wild turkey.
Step-by-step explanation:
The passage provided is a nonargument because it simply states a fact about the red featherless head of the turkey vulture and how it resembles that of a wild turkey; there is no attempt to prove or persuade anything. Therefore, the correct selection would be b. Nonargument - Analogy, since it draws a comparison between the appearance of a turkey vulture's head and a wild turkey's head without providing any further argumentation.