To apply the Pythagorean Theorem, we need to know the lengths of the two sides of a right triangle. The theorem states that:
\[ a^2 + b^2 = c^2 \]
where \( c \) is the hypotenuse (the longest side), and \( a \) and \( b \) are the other two sides.
However, since no specific lengths for the sides of the triangle are provided in your question, I cannot perform the calculation or select the correct answer from the responses provided.
Please provide the lengths of the sides, and I can help calculate the unknown side length.