A charge +q is placed somewhere inside the cavity of a thick conducting spherical shell of inner radius R1 and outer radius R2. A charge – Q is placed at a distance r > R2 from the centre of the shell. Then the electric field in the hollow cavity-
(A) depends on both +q and – Q
(B) is zero
(C) is only that due to – Q
(D) is only that due to +q