When `CS_2` layer containing both `Br_2` and `I_2` is shaken with excess of `Cl_2` water, the violet colour due to `I_2` disappears and orange colour due to `Br_2` appears. The disappearance of violet colour is due to the formation of
A. `I_(3)^(-)`
B. `HIO_(3)`
C. I Cl
D. `I^(-)`