Option C. It contains all the sources you cite in your article, which appear in alphabetical order by author name.
According to MLA, all the works cited in your article are listed in a separate page, which is at the ende of the article and starts with the title Works cited. The list is ordered alphabetically by last name of author.
The correct answer is C, because when writing an essay, you need to state the authors name, title of work, publisher, date of publication, date that you accessed the source, and the URL address of that site.