The correct answer would be, check punctuation and fix citations.
In the lesson, it states, "Editing involves going through your paper, line-by-line, and fixing format, grammar, spelling, punctuation, and your citations. If editing is about how a paper looks, from font choice to spelling, then revising is about making changes to your paper to have it flow and make more sense. If you're doing a good job revising, you should be adding phrases, removing segments, and moving parts of the paper around to make sure it's crystal-clear for the reader."
