Which angle is an exterior angle of the triangle?

Triangle L M N. Angle L is 1, angle M is 2, angle N is 3. Side M N extends to form angle 4.
A. 1
B. 2
C. 3
D. 4

Answer quick pls

Which angle is an exterior angle of the triangle Triangle L M N Angle L is 1 angle M is 2 angle N is 3 Side M N extends to form angle 4 A 1 B 2 C 3 D 4 Answer q class=