Question $5.[5$ pts$.]$ Which one of the repletion coefficients for a tidal bay suggests the largest planform bay area if the velocity in the tidal channel and the total head loss coefficients remain the same? Provide a brief explanation.

$($a$)0\mathrm{.}2.$

$($b$)0\mathrm{.}3$

$($c$)0\mathrm{.}4.$

$($d$)0\mathrm{.}5$