Final answer:
Jon Reese would be considered a credible source on a subject if his occupation aligns with the topic he is writing about, with Jon Reese, an animal biologist being the most likely to indicate credibility if the content is about animal behavior or conservation.
Step-by-step explanation:
To determine which occupation would most credibly suggest that Jon Reese is a reliable source on a subject, it is important to consider his job about the content of his writing. An author's credibility is often linked to their expertise and experience in a specific field. For instance, if Jon Reese is writing about animal behavior or conservation, Jon Reese, an animal biologist would be the most indicative of his authority on the subject.
This is because as an animal biologist, he is likely to have the formal education and practical experience required to conduct thorough research and contribute meaningful insights on topics related to biology.
In contrast, while a zookeeper also works with animals, the depth of their scientific training may not be as comprehensive as that of a biologist. A circus performer, although knowledgeable about animals in a different capacity, typically focuses on training and performance rather than scientific analysis.
An American literature teacher would possess expertise in a completely different area, unrelated to animals or biology, thereby making this occupation the least relevant to establishing credibility in the field of biology.