Which of the following reaction sequences would be the best for the synthesis of $2$-pentanone?
- A$CH_3-CH_2-CH_2-CHO$ $\xrightarrow[Et_2O]{CH_3MgI}$ $\xrightarrow{H_3O^{+}}$
- B$CH_3-CH(O)CH_2-CH_2$ $\xrightarrow[Et_2O]{CH_3MgI}$ $\xrightarrow{H_3O^{+}}$
- C$CH_3-CH_2-CH_2-CN$ $\xrightarrow[Et_2O]{CH_3MgI}$ $\xrightarrow{H_3O^{+}}$
- D$CH_3-CH_2-CHO$ $\xrightarrow[Et_2O]{CH_3MgI}$ $\xrightarrow{H_3O^{+}}$
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