Respuesta :

Never, due to what vertical angles are. Imagine you have two lines that intersect each other. The angles that are directly across from each other are vertical angles, and are therefore not adjacent.

Two vertical angles are never adjacent. The correct answer between all the choices given is the last choice or letter C. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.