Suppose Chris Is a Potter Who Makes Mugs The Marginal Cost If the 4^th Mug Per Day Is

Suppose Chris is a potter who makes mugs. His total costs depend on the number of mugs he makes each day, as shown in the table below. $$\begin{array} { | c | c | } \hline \begin{array} { c } \text { Number of } \\\text { Mugs Per Day }\end{array} & \begin{array} { c } \text { Total Cost } \\\text { Per Day }\end{array} \\\hline 0 & \$ 10 \\\hline 1 & \$ 14 \\\hline 2 & \$ 19 \\\hline 3 & \$ 25 \\\hline 4 & \$ 32 \\\hline 5 & \$ 40 \\\hline 6 & \$ 49 \\\hline\end{array}$$ The marginal cost if the 4^th mug per day is ______.

A) $5
B) $7
C) $8
D) $32