AgCl is a sparingly soluble salt, with a solubility of about 10-5 M in pure water. Adding KCN increases the solubility of AgCl because:
A. CN- reacts with Ag+ to make a soluble complex.
B. CN- is a base, which increases the pH to form soluble AgOH.
C. K+ reacts with Cl- to form solid KCl.
D. CN- reduces Ag+ to Ag metal.
E. CN- reacts with Ag+ to make a sparingly soluble salt with a larger Ksp than AgCl.