Look at the prototype boat below. Is this sail a right triangle? Why or why not?

A. No, because (2.5)^2 + (1.7)^2 ≠ (2.5)^2

B. No, because no sailboat has a right-angled sail.

C. Yes, because (2.3)^2 + (2.5)^2 ≠ (1.7)^2

D. Yes, because the side lengths satisfy the Pythagorean theorem.