Consider the following reaction:
`C_6H_5-underset(H)underset(|)overset(CH_3)overset(|)C-Br+H_2Oto OH-underset(H)underset(|)overset(CH_3)overset(|)C-C_6H_5+HBr`
The reaction proceeds with 98% racemistation. The reaction may follow
A. `S_(N^1)` mechanism
B. `S_(N^2)` mechanism
C. E1 mechanism
D. E2 mechanism