Answer:
A. Make sure that each of your paragraphs has all the details that it needs
Step-by-step explanation:
Let's look at every option and see why they are wrong. D is wrong because while that is something that you should do, that's something you do when you write the first draft. Revising is for when you are done with the first draft and are polishing it to submit. C is also wrong due to the same reason. That is something you do after receiving the prompt you are writing about, not something you do in the revising phase. While B sounds like something you would do in the revising phase, it is something you do after in the editing phase. The difference between the two is the revising phase is for making sure your supporting details are there and your paragraphs are organized correctly, while you look over your paragraph for grammatical errors and things like that in the editing phase.