I think its III. commas used to introduce short quotations appear outside the quotation marks.
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."
Siberian tiger from Arabia
I think the answer is A. Run-on