Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : CH3CH2CH2CH2I undergoes S N2 reaction faster than CH3CH2CH2CH2Cl , Reason (R) : Iodine is a better leaving group because of its large size. In the light of the above statements, choose the correct answer from the options given below:

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

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