从溴乙烷制取1，2-二溴乙烷，下列转化方案中最好的是（  ）

A：${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\text{Br}\begin{array}{c}\underrightarrow{\text{NaOH}水溶液}\\ \text{Δ}\end{array}$ ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\text{OH}$ $\begin{array}{c}\underrightarrow{浓{\text{H}}_{\text{2}}{\text{SO}}_{\text{4}}}\\ {170}^{\circ }\text{C}\end{array}{\text{CH}}_{\text{2}}{\text{=CH}}_{\text{2}}\stackrel{{\text{Br}}_2}{\to }$ ${\text{CH}}_{\text{2}}{\text{BrCH}}_{\text{2}}\text{Br}$

B：${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\text{Br}\underrightarrow{{\text{Br}}_{\text{2}}}{\text{CH}}_{\text{2}}\text{Br}{\text{CH}}_{\text{2}}\text{Br}$

C：${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\text{Br}\begin{array}{c}\underrightarrow{\text{NaOH}}\\ 醇溶液\end{array}{\text{CH}}_{\text{2}}{\text{=CH}}_{\text{2}}\underrightarrow{\text{HBr}}{\text{CH}}_{\text{2}}{\text{BrCH}}_{\text{3}}\underrightarrow{{\text{Br}}_{\text{2}}}{\text{CH}}_{\text{2}}{\text{BrCH}}_{\text{2}}\text{Br}$

D：${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\text{Br}\underrightarrow{\text{NaOH}醇溶液}{\text{CH}}_{\text{2}}{\text{=CH}}_{\text{2}}\underrightarrow{{\text{Br}}_{\text{2}}}{\text{CH}}_{\text{2}}{\text{BrCH}}_{\text{2}}\text{Br}$