Which of the following angles are supplementary angles?
Two angles are supplementary angles when these angles add to 180°. Hence, angle I and III are supplementary angles. This is because 101° add with 79° gives 180°.
As for angle II and IV, they are also supplementary angles. This is because when we add 65° with 115°, we get 180°.
Clearly, I-III and II-IV are supplementary angles. Hence, the answer is C.
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