Assertion A : Hydrolysis of an alkyl chloride is a slow reaction but in the presence of NaI, the rate of the hydrolysis increases.

Reason R : I$^{-}$ is a good nucleophile as well as a good leaving group.

In the light of the above statements, choose the correct answer from the options given below

1. A A is true but R is false
2. B A is false but R is true
3. C Both A and R are true and R is the correct explanation of A Correct answer
4. D Both A and R are true but R is NOT the correct explanation of A