When Solid Silver Chloride Is Shaken with a 0

When solid silver chloride is shaken with a 0.1 molar aqueous solution of potassium iodide,most of the silver chloride is converted to silver iodide.This transformation takes place because:

A) silver iodide is less soluble than silver chloride
B) I^- is a better reducing agent than Cl^-
C) I^- has a larger radius than Cl^-
D) the K_sp of AgI is larger than the K_sp of AgCl
E) potassium chloride precipitates