Sam is an artist, and he wants to purchase frames to display his work at home. He wants to frame no fewer than 10 of his pieces, and he can spend a maximum of $225. Large frames cost $24, and medium frames cost $18.

Which system of inequalities can Sam use to determine the number of large frames, x, and medium frames, y, that he can purchase to meet his needs?

A. 18x + 24y ≤ 225
x + y ≥ 10

B. 24x + 18y ≥ 225
x + y ≤ 10

C. 18x + 24y ≥ 225
x + y ≤ 10

D. 24x + 18y ≤ 225
x + y ≥ 10