Assertion `(A)`: IN comparison to `C_(2) H_(5)Br`, it is difficult to carry out `SN` reaction o vinyl bromide.
Reason `(R): Vinyl group is electron donating.
A. Both `(A)` and `(R)` are true and `(R0` is the correct explanation of `(A)`.
B. Both `(A)` and `(R)` are true but `(R)` is not the correct explanation of `(A)`.
C. `(A) is true but `(R)` is false.
D. `(A) is false but `(R)` is true.