I'd have to go with D because Romeo and Juliet can't be together because their families hate each other. They are defined by their family names and if they go together one of them would share the family name of the other.
B. “The Yukon lay a mile wide and hidden under three feet of ice.”
C. “On top of this ice were as many feet of snow.”
D. “It was all pure white, rolling in gentle undulations.”
E. “save for a dark hairline that curved and twisted from around the spruce-covered island to the south”
The answer is B unreliable narrator. This is the correct answer because he is not always trustworthy so you shouldn't rely on this narrator.
There are many circumstances such as
1. Challenging upbringing
2. A series of bad/unfortunate events that affect the life of the person
3. Loss of a person
4. Mental illnesses
5. Bad health
6. Bitterness
and more!