Q$\mathrm{.}67.$ A rectangular channel $2\mathrm{.}0$ m wide carries a discharge of $6$ cumecs. The minimum specific energy is

$($A$)14\mathrm{.}57$ m

$($B$)1\mathrm{.}457$ m

$($C$)145\mathrm{.}7$ m

$($D$)0\mathrm{.}1457$ m

$($E$)$ Question not attempted