The correct way to cite a dictionary entry according to MLA style is:
D. "Noon." The Oxford English Dictionary. 2nd ed. 1989. Print.
When citing a dictionary entry, the writer should include the author's name (if available), the entry title, the title of the dictionary (in italics,) the publication and the source (either print or the URL used, if it was accessed online.)
Pay attention: the options provided in the question lack italics. I took the liberty to add the italic font to the correct option.