A charge +q is placed somewhere inside the cavity of a thick conducting spherical shell of inner radius `R_(1)` and outer radius `R_(2)`. A charge – Q is placed at a distance `r gt R_(2)` 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