1-methylcyclopentene can be converted into the given compound
by the use of which of the following reagent?
A. `"Dil"."D"_(2)"SO"_(4)`
B. `Hg(Oac)_(2) + D_(2)O"followed by" NaBD_(4)`
C. `B_(2)D_(6) "followed by" D_(2)O, AcOD`
D. `B_(2)D_(6) "followed by" D_(2)O_(2), NaOD`
