Refer to the Table Shown A)$2
B)$3

Multiple Choice

Refer to the table shown. The marginal cost of producing the fourth unit of output is: $\begin{array}{|c|c|}\hline \text { Units of output } & \text { Total cost } \\\hline0 & 5 \\\hline 1 & 11 \\\hline 2 & 16 \\\hline 3 & 20 \\\hline 4 & 23 \\\hline 5 & 25 \\\hline 6 & 26 \\\hline\end{array}$

A) $2.
B) $3.
C) $4.
D) $5.