Figure 1 Labour (Number of Workers) -Refer to Figure 1

Figure 1 Labour (number of workers)

$\begin{array}{cccc} \text { Labour (number of } & \text { Output } & \text { Marginal Product } & \text { Value of MPL } \\ \text { workers) } & \text {per hour } & \text { of Labour (MPL) } \\\hline0 & 0 \\ 1 & 5 \\ 2 & 9 \\ 3 & 12 \\ 4 & 14 \\ 5 & 15\end{array}$
-Refer to Figure 1. What is the marginal product of labour as the firm moves from using three workers to using four workers?

A) 0
B) 2
C) 8
D) 12
E) 14