The equation below can be used to solve which of the following word problems? 2x + 4y = 18
A. The price of four books is $18 more than the price of two books. What is the price per book?
B. The price of four books equals $18. What is the price per book?
C. John bought a certain number of $2 books and $4 books for a total of $18. How many of each book did he buy?
D. The price of two books is $18 more than the price of four books. What is the price per book?