Read the following passage. Stew was so angry, he could feel the red-hot rage bubble
up in him like lava in a volcano. Of course, the police
officer interviewing him did not realize this. Stew was good
at hiding his rage. He kept it like an iceberg, barely showing
on the surface, but large and powerful underneath.
Which most likely explains why the author describes the character as both
"an iceberg" and "a volcano"?
A. To show that the character was guilty of the crime
B. To show that the police officer was treating the character fairly
C. To show that the character could not control his emotions
D. To show that the character's anger was large and powerful

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.