Franco is buying nails for a construction project. each box of nails cost $14 and contains 225 nails. franco estimates that he needs 1,800 nail. how can franco calculate the total cost of nails?
A. 14/225 = x/1800 needs 1,800 nails.
B. 14/1800 = x/225
C. 1800/225 = 14/x
D. 1800/x = 14/225