The answer to the question is C.
Hi there!
In the Odyssey, Melantho is a foil to Eurynome and Eurykleia.
Melantho, the sibling of Melanthios, is a palace servant who is loyal to the suitors rather than the Queen. In order to die in the most humiliating way, she is hanged.
In literature, a foil character is a character that is opposite to the main character in personality, physical appearance, or both.
Answer:
C. To show a real-life example of a volcano
Explanation:
If the purpose was (A) to show how a volcano works, it would probably be shown in greater detail and from a clearer perspective. It the purpose was (B) to show the different parts of a volcano, than the image would not be so small or merely shown from the top. If the purpose was (D) to show the destructive power of a volcano, then it would likely show lava and its damage. Hence, the most probable answer is (C) to show a real-life example of a volcano.
(disclaimer: this is only an educated guess)