`H_(2)S` in the presence of HCI precipitates group II radicals but not of the group IV because
A. HCI activate `H_(2)S`
B. HCI increses cone of `CI^(Theta)` due to common ion effect
C. HCI decreses cone of `S^(2-)` due to common ion effect
D. HCI lowers the solubility of `H_(2)S`in soin