Where can the prpendicular bisectors of an acute 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 iii only

The meeting point of the 3 perpendicular bisectors of a triangle's sides is called the circumcenter.
The circumcenter of an acute triangle is always inside the triangle.
so the answer is "a"

Source:
http://www.1728.org/trictr.htm