$t-$butyl alcohol is best prepared using:

$($a$)$

$($b$)$

$C{H}_{3}C{H}_{2}C{H}_{2}MgBr{?}_{E{t}_{2}O}^{C{O}_2}{H}_3{O}^{o+}$

$($c$)$

$($d$)$

$($b$)$

$($c$)$

$($a$)$

$($d$)$