Which of the following reaction sequences would be the best for the synthesis of $t$-butyl alcohol?

• A
  $CH_3MgBr + HCHO$ $\xrightarrow{Et_2O}$ $\xrightarrow{H_3O^{+}}$
• B
  $CH_3CH_2CH_2MgBr$ $\xrightarrow[Et_2O]{CO_2}$ $\xrightarrow{H_3O^{+}}$
• C
  $CH_3MgBr + CH_3COCH_3$ $\xrightarrow{Et_2O}$ $\xrightarrow{H_3O^{+}}$
• D
  $CH_3CH_2MgBr + CH_3CHO$ $\xrightarrow{Et_2O}$ $\xrightarrow{H_3O^{+}}$