Answer: Choice A

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Step-by-step explanation:
The pythagorean theorem is

The value of c is always the longest side, aka hypotenuse.
The order of 'a' and b doesn't matter.
So a = 14, b = 48, c = 50
We have

We also have

Both sides result in 2500 which proves that
is a true statement. Therefore, we do have a right triangle.