The anglesx-10° and 190-x° are :-
interior angles on the same side of the transversal
making a linear pair
complementary
supplementary
Given angles are x-10° and 190-x°
Adding both the angles
=x-10+190-x=190-10=180°
When the sum of two angles is180°, then the angles are known as supplementary angles.
Hence, option D is he correct .