Which pairs of angles in the figure below are vertical angles?

Answer:
The correct option are A and C.
Step-by-step explanation:
If two lines intersect each other at a point, then each of the pairs of opposite angles made by these lines are called vertical angles.
From the given figure it is noticed that the line SA and DE intersect each other at point O.
[tex]\angle EOA=\angle DOS[/tex]
[tex]\angle SOE=\angle DOA[/tex]
The line OB touch the lines SA and DE. It does not intersect the lines, therefore the line OB does not make any vertical angle.
Therefore option A and C are correct.