I believe it is B, because it's using 'like' to compare the Arkenstone to different things.
A simile compares things with the words 'like' or 'as'.
This is math, not English, but okay xD
"Two intersecting lines are perpendicular if and only if they form four 90 degree angles" would be my answer.
Answer:
D.
Explanation:
Although A seems like a great answer as well, D is a statement that only gives one side of a story. You and I both don't know the man, but the speaker of the sentence has already gotten you and I to think about one thing: The man's lack of intelligence.