Solution:
we have been asked to find the true statement about the exterior angle from the given statements.
As we know that the exterior angles are always out of the triangle and it makes a sum of 180 with anyone of the internal angle of the triangle.
The pair lies on the same straight line and makes a pair.
Hence we can say that it is formed by a linear pair with one of the interior angles of the triangle.
Hence the correct option is D.
