The correct citation for a book with two authors would be the following. Of course I do not know any of the information about the book so that will just be stated as needed.
First Authors First name, First Author's Last name, and Second authors first name Second author's last name. Book Title. Edition ed. Vol. Publishing City: Published by, Year. N. pag. Print.
Therefore we can conclude that the only entry that matches up perfectly is entry C, making that our correct answer.
Hope this helps! If you have any other questions or would like further explanation just let me know! :)