SAT Right Triangles - Pythagorean Theorem

Geometry Level 1

Which of the following CANNOT be the lengths of the sides of an obtuse triangle?

(A) \(\ \ 5, 6, 10\)
(B) \(\ \ 6, 6, 6\sqrt{2}\)
(C) \(\ \ 6, 8, 11\)
(D) \(\ \ 10, 15, 20\)
(E) \(\ \ 20n, 30n, 40n\)