Answer: B. ∠K ≅ ∠N
Explanation:
We know that if two triangles are congruent , then the corresponding angles and sides are congruent by CPCTC.
Given:

Therefore , the corresponding angles and sides of
are congruent.
∠J corresponds ∠M
∠K corresponds ∠N
∠L corresponds ∠P
⇒ ∠J ≅ ∠M
∠K ≅ ∠N
∠L ≅ ∠P

From the given options, the statement which must be true :-
∠K ≅ ∠N