Answer:
The beliefs of the two groups directly opposed each other.
Hope this helps :)
I think this is A. Because it can add subtle hints of the setting and describes the characters.
No, it was both the families fault. If they didn't have the feud, the whole process wouldn't have happened. Romeo and Juliet aren't supposed to be together because of the feud that was on for so long. But if there never was one, they would probably alive and together.
A good paragraph has 5 to 7 sentences.