A packed$-$tower air stripper is used to remove methyl tert$-$butyl ether $($MTBE$)$ from wastewater as shown in the figure below, at $1\mathrm{.}0$atm. The compositions shown in the figure are mole fractions. The following data apply:

$y_{\text{M}\text{T}\text{B}\text{E}}=78x_{\text{M}\text{T}\text{B}\text{E}}$

Height of overall liquid$-$phase transfer unit $=1\mathrm{.}3ft$

$v....m.-10951-6$

The height $(ft)$ of packing required is most nearly:

$($A$)1\mathrm{.}3$

$($B$)2\mathrm{.}4$

$($C$)4\mathrm{.}7$

$($D$)7\mathrm{.}0$