If you plan to make a document for an audience, you want to do what they want to know, most likely.
So For A. You don't want to interest yourself, you want to interest the audience.
For B. Your readers are you priority, so knowing how much they know would help.
For C. Sources are whole other subject but to please them, you may worry about that a little less.
For D. Same as C
So B would be best.
Answer:
The nuclear reactions stop
Explanation:
I did the question and got it right