Answer:
Correct option is B that is Adjacent interior Angle.
Step-by-step explanation:
Given: A triangle
An exterior angle of the triangle.
We need to tell name of interior angle which has a side and a vertex of the exterior angle of the triangle.
Since, Here we have a common vertex and a common arm of angle with exterior angle. Which means it is an adjacent angle with exterior angle.
Also it is interior angle of triangle.
Thus, Correct option is B that is Adjacent interior Angle.