Answer:
C) The circumcenter is on the outside of an obtuse triangle.
Explanation:
You want to know where the circumcenter is in relation to the sides and vertices of different triangles.
Circumcenter
The circumcenter of a triangle is the center of the circle through its vertices. As such, it will never lie on a vertex of the triangle.
As you can see in the attached figure, the circumcenter of an acute triangle is inside the triangle.
For a right triangle, the circumcenter is the midpoint of the hypotenuse.
The circumcenter of an obtuse triangle is outside the triangle.
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Additional comment
The circumcenter is located at the point where the perpendicular bisectors of the sides meet.
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