Answer:
(B)
Explanation:
The given options are:
A. 2, 2,

B. 9,40, 41
C.

In order to prove that the given side lengths form a right triangle, we will satisfy the Pythagoras theorem.
A.

⇒

⇒

which does not satisfy the theorem, thus this option is incorrect.
B.

⇒

⇒

which satisfies the theorem, thus this option is correct.
C.

⇒

⇒

which does not satisfy the theorem, thus this option is incorrect.