How Much Are Additional Units of Labor Worth Based on the Following

How much are additional units of Labor worth based on the following sensitivity report? $\text { Changing Cells }$

$\begin{array}{llrr}&& \text { Final}& \text { Rediuced}\\\text { Cell } & \text { Name } & \text { Value } & \text { Gradient } \\\hline \$ B \$ 4 & \text { Number to make: } \mathrm{X}_{1} & 9.42 & 0 \\\$ \mathrm{C} \$ 4 & \text { Number to make: } \mathrm{X}_{2} & 1.71 & 0\end{array}$


$\text { Constraints }$
$\begin{array}{llrr}& & \text {Final}&\text {Lagrange}\\\text { Cell } & \text { Name } & \text { Value } & \text { Multiplier } \\\hline \$ \mathrm{D} \$ 8 & \text { Wood } & 42 & 0 \\\$ \mathrm{D} \$ 9 & \text { Labor } & 132 & 1.21 \\\$ \mathrm{D} \$ 10 & \text { Plywood } & 24 & 2.57\end{array}$

A) 0
B) 1.21
C) 2.57
D) 9.42