The answer to this is B. You are going to edit the composition of the article that you are reviewing. There are different things that you may edit. You can check out the grammar of the article. It is also best if you would check the punctuation marks that are used in the article.
If you have a good grasp of the English language, this is not going to be hard for you to do. You always have the option to learn more so that you can do better in editing every time. Reading more books and other literary works will be good training in order to do better in spotting mistakes and editing.