Niles bought 4 packs of baseball cards. he also spent $14 for a notebook to hold the baseball cards. he spent a total of $23. niles wrote and solved the equation 4x + 14 = 23 to find the cost of each pack of baseball cards. which of the following is true?

a. niles could subtract 14 from 23 to find the cost of each pack of baseball cards.
b. niles could divide 14 by 4 to find the cost of each pack of baseball cards.
c. niles cannot use arithmetic to find the cost of each pack of baseball cards.
d. niles spent $2.25 on each pack of baseball cards.