Assertion (A) : Benzonitrile is prepared by the reaction of chlorobenzene with `KCN`.
Reason (R) : Cyanide `(CN^(-))` is a strong nucleophile.
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not a correct explanation of A.
C. A is true but R is false.
D. A is false but R is false.
