D. To show that the character's anger was large and powerful.
Explanation:
It can be seen in the given passage that Stew was so angry that it can be compared to the red-hot bubble that forms inside a volcano just like in Stew's body and that it was also likened to the tip of an iceberg where it means that Stew was so good at hiding and containing his emotions despite being so angered.
The other choices are irrelevant especially choice A wherein the passage doesn't talk about Stew being guilty of any crime at all. While Choice B is also not related to the question at all because the main focus of the given passage was about Stew's character and not the police officer's. Lastly, choice C isn't the answer as well because the phrase "Stew was good at hiding his rage. He kept it like an iceberg, barely showing on the surface..." where it clearly says that Stew was capable of controlling his emotions.
None of the answers really do it justice, but I’d say D. His anger is very powerful, but the iceberg shows that he easily concealed it with emotional “coolness”.
