In the figure shown the elctric potential energy of the system is : `(q` is at the centre of the conducting neutral spherical shell of inner radius a and outer radius `b`)
A. `0`
B. `(k q^(2))/(2b)`
C. `(kq^(2))/(2b) -(kq^(2))/(2a)`
D. `(kq^(2))/(2a) - (kq^(2))/(2b)`