On heating with $\text{KOH}$ dissolved in ethanol, halogenoalkanes may undergo elimination, producing alkenes. What elimination products are possible if $2$-bromobutane is heated with $\text{KOH}$ dissolved in ethanol?
- A$\text{CH}_3\text{CH}=\text{CHCH}_3$ only
- B$\text{CH}_3\text{CH}_2\text{CH}=\text{CH}_2$ only
- C$\text{CH}_3\text{CH}=\text{CHCH}_3$ and $\text{CH}_3\text{CH}_2\text{CH}=\text{CH}_2$
- D$\text{CH}_3\text{CH}=\text{CHCH}_3$ and $\text{CH}_2=\text{CHCH}=\text{CH}_2$