Answer
D
Work Step by Step
1) $Pb^{2+}+I^-$: Insoluble, precipitates $PbI_2$
2) $Ca^{2+} + CO_3^{2-}$: Insoluble, precipitates $CaCO_3$
3) $Ba^{2+} + SO_4^{2-}$: Insoluble, precipitates $BaSO_4$
4) $Ag^++OH^-$: Insoluble, precipitates $AgOH$
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