The correct answer among all the other choices is "explains a subject by illustration." Exposition is a kind of nonfiction writing which <span>explains a subject by illustration. </span>Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.

Gee, with those fang-like teeth, the Atlantic wolffish is one creepy-looking creature.

<span>Photographs of treasures and artifacts that the divers found
Discoveries of sunken ships are usually most important when they contain things that are important. Showing pictures of the treasures and artifacts found on the ship would alert his audience that the discovery was very important historically, based on what the divers found. </span>
Answer:
The primary purpose of the prologue in Sugar Changed the Worldis to inform the reader about the impact of sugar on world events and culture. First, the text introduces the history of sugar production and indicates that it led to slavery.