Triangle ABC has side lengths 8 inches, 17 inches, and 15 inches. Sofia uses the following steps to conclude that triangle ABC is not a right triangle. What mistake did Sofia make?

A. Sofia made a calculation error

B. Sofia used the length of one of the legs as c when she should have used the length of the longest side as c

C. Sofia does not know if the triangle ABC is a right triangle, so she cannot use the Pythagorean Theorem or it's converse

D. Sofia's conclusion is incorrect. When the sides of a triangle does not satisfy a^2+b^2=c^2, you cannot conclude that the triangle is a right triangle