A sample of sparingly soluble `PbI_(2)(s)` containing radioactive `I-133` is added to `0.10M KI(aq)` and stirred overnight. Observations about this system include which of the following?
(P) The radioactivity of the liquid phase increases significantly.
(Q) The concentration of the `I^(-)` ion in solution increases significantly.
A. P only
B. R only
C. Both P and Q
D. Neither P nor Q