The figure below shows two triangles EFG and KLM. which of the following can be used to prove that triangle EFG is also a right triangle?

A. Prove that the sum of a and c is greater than b

B. Prove that the sum of a and b is greater than c

C. Prove that the ratio of EF and KL is greater than 1 and hence, the triangles are similar by AA postulate

D. Prove that KL is equal to c by Pythagorean Theorem