The reaction $R-Cl+R'ONa$---------->$ROR'+NaCl$.The reaction is catalysed by the addition of small amounts of $NaI$ because

Question

(a) Iodide ion is better nucleophile than OR ion

(b) Iodide ion is better leaving group than chloride ion

(c) Iodide ion is both better nucleophile as well as good leaving group

(d) Iodide ion can increase the leaving tendency of chloride ion with its greater polarisablity