Propanoic acid may be converted into propene through a two-stage synthesis. Which row gives reagents that are suitable for this synthesis?
- Afirst stage: $\text{LiAlH}_4$; second stage: concentrated $\text{H}_2\text{SO}_4$
- Bfirst stage: $\text{LiAlH}_4$; second stage: $\text{NaOH}$ in ethanol
- Cfirst stage: $\text{NaBH}_4$; second stage: concentrated $\text{H}_2\text{SO}_4$
- Dfirst stage: $\text{NaBH}_4$; second stage: $\text{NaOH}$ in ethanol