Solubility of AgCl is minimum in 

Solubility of any sparingly soluble salt decreases with the increase in common ion concentration.

Common ion concentration;

$\begin{array}{l}\left(1\right)\left[{\mathrm{Cl}}^{-}\right]=0.1\times 1=0.1\mathrm{M}\\ \left(2\right)\left[{\mathrm{Cl}}^{-}\right]=0.1\times 2=0.2\mathrm{M}\\ \left(3\right)\mathrm{Zero}\\ \left(4\right)\left[{\mathrm{Ag}}^{+}\right]=0.1\times 1=0.1\mathrm{M}\end{array}$