C
Step-by-step explanation:
The pythagorean theorem states that all right triangle side lengths can go into the equation + =
All you need to do is insert the given number and see if it turns out true.
If you go through each equation, C is the only one that turns out wrong, making it not possible.
(For example, for A, (5×5) + (12×12) = 13×13. This becomes 169 = 169, which of course is true.)