What kind of angle pairs are these?
A. Obtuse
B. Acute
C. Vertical
D. None of these

Answer:
acute
Step-by-step explanation:
they are less than 90%
Answer:
C. Vertical / B. Acute
Step-by-step explanation:
Vertical angles are angles opposite each other where two lines cross.
The angles shown are displaying this. They are also under 90 degrees, so are acute too.