The Sunshine Corporation Finds That Its Costs Are $40 When $$\begin{array} { c c c } \text { Output } & & \text { TVC } \\\hline1 & & \$ 30 \\2 & & 50 \\3 & & 65 \\4 & & 85 \\5 & & 110\end{array}$$

The Sunshine Corporation finds that its costs are $40 when it produces no output.Its total variable costs (TVC) change with output as shown in the accompanying table.Use this information to answer the following question. $$\begin{array} { c c c } \text { Output } & & \text { TVC } \\\hline1 & & \$ 30 \\2 & & 50 \\3 & & 65 \\4 & & 85 \\5 & & 110\end{array}$$ Refer to the information.The marginal cost of the third unit of output is:

A) $105.
B) $25.
C) $15.
D) $20.