Please help, multiple choice

Answer:
D. 9, 12, 15
Step-by-step explanation:
You can use the Pythagorean Theorem to solve.
a^2 + b^2 = c^2
9^2 + 12^2 = c^2
81 + 144 = 225
Remember, c is squared.
The square root of 225 is 15.
D is the only answer that is correct.