Andrew is using three pieces of scrap wood to build a wall shelf in his bathroom. The shelf will be shaped like a triangle, and the pieces of scrap wood measure 12 inches, 15 inches and 9 inches long. Will the shelf be shaped like a right triangle? Why or why not?
A. Yes; 9² + 15² = 12²
B. Yes; 9² + 12² = 15²
C. No; 9² + 12² ≠ 15²
D. No; 15² + 12² ≠ 9²