Select correct statement (s) about following reaction :
`C_(2) H_(5) O^(-) + CH_(3) CH_(2) overset(Br) overset(|) CHCH_(3) overset(C_(2)H_(5)OH) to`
A. It is termed as `beta`- elimination reaction
B. `C_(2)H_(5)O^(-)` is a Bronsted -base
C. Produced are 1-butene and 2-butene
D. All are correct statements