For the reaction :
`PbI_(2)(s)rarrPb^(2+)(aq)+2I^(-)(aq)` `K_(sp)=8.4xx10^(-9)`
What is the concentration of `Pb^(2+)` in mol/L in a saturated solution of `PbI_(2)` in which [`I^(-)`]=0.01M?
A. `8.4xx10^(-7)`
B. `8.4xx10^(-5)`
C. `1.3xx10^(-3)`
D. `2.0xx10^(-3)`