A point charge q is placed at a distance of r from cebtre of an uncharged conducting sphere of rad `R(lt r)`. The potential at any point on the sphere is
A. zero
B. `(1)/(4piepsilon_(0))(q)/(r)`
C. `(1)/(4pi epsilon_(0))(qR)/(r^(2))`
D. `(1)/(4piepsilon_(0))(qr^(2))/(R)`