Answer:
The central idea of the book is, aspects of good citizens
I think it would be A) bought
C) your welcome oooooooooooooooooo
What I do I write what’s the topic of what your writing and then do your supporting details (it depends how much you need) you should site your source if you have to, then do your conclusion.
It would be the second choice : You can understand what level of formality is appropriate by listening to and observing others.