Where can the bisectors of the angles of an obtuse triangle

Where can the bisectors of the angles of an obtuse triangle intersect?

I. inside the triangle
II. on the triangle
III. outside the triangle

A. I only

B. III only

C. I or III only

D. I, II, or I

Solution

can the bisectors of the angles of an obtuse triangle intersect
I. inside the triangle

A. I only