Hey there!
Your answer is A. another writer's interpretation of a subject.
Since another writer is the one who wrote the information, you have to cite the source to properly acknowledge that the information was not created by you.
You do not have to cite common knowledge because it is something that most people already know.
You do not have to cite your own interpretation or opinion of the subject because it is your own work.
Hope this helps!
Stormy weather has always brought great calmness in my life. When it’s storming, the sky is dim but not eerie. It’s the best time to take a seat and read a book. The constant sound of raindrops on my window helps me to sleep deeply and wake up in the morning feeling refreshed ever. In conclusion, stormy weather brings joy to me by helping me sit back and relax.
The answer to that question is beneficial
No, Romeo did not cheat on Juliet, if you're asking about Shakespeare's play, Romeo and Juliet.