Answer: D
Step-by-step explanation:
Logos appeals to the audience's logic/reason, Ethos appeals to the speaker's status or authority, making the audience more likely to trust them, and Pathos appeals to the emotions.
The best way to identify ethos is noticing which sentences come from credible sources or smart people. "I'm a doctor, and I can tell you this medicine is safe," something like that. D is the opinion of multiple professional zoologists, so we know it's ethos.