A year on Mars lasts 687 days. Robot Pete
That means he was born 2,748 days ago, assuming
days. Robot Pete lives on Mars. He is exactly 4 Mars years old.
2,748 days ago, assuming a robot was born, which makes no
sense. But who cares!
Or Pete's older brother Jack was born 316 days before Pete. How many days old is
ont forget, to be older, Pete should be MORE days old than Jack! If your answer
is less than 2,748 then think again.

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! :)