Select the best method for the preparation of the following compounds :
A. reaction of cyclohexanone with `CH_(3)Li`
B. reaction of 1- methylcyclohexene with `Hg(Oac)_(2)` followes by `NaBH_(4)`
C. reaction of cyclohexene with `BH_(3), NaOH//H_(2)O_(2)`, following by `CH_(3)Br`
D. reaction of cyclohexene with `MCPBA`, followed by `CH_(3)MgBr`
