Let the orthocenter and centroid of a triangle be A (-3, 5) and B (3, 3) respectively. If C is the circumcentre of this triangle, then the radius of the circle having line segement AC as diameter, is :

Question

( A ) $\sqrt{10}$
( B ) $2\sqrt{10}$
( C ) $\frac{3\sqrt{5}}{2}$
( D ) $3 \sqrt{\frac{5}{2}}$