Use the picture below to answer the question: For the statement "< D is supplementary to < A and < D is supplementary to < B, so < A is congruent to < B," there reason the

The correct option is:
a. Congruent Supplements Theorem
Explanation:
If two angles are supplements of the same angle (or congruent angles), then the two angles are congruent.
This means < A and < D is supplementary to < B, so < A is congruent to < B.
This is the Congruent Supplements Theorem