Use the Information in the Table Below to Determine the Average

Multiple Choice

Use the information in the table below to determine the average cost of producing 4 units of output.
$$\begin{array} { l r r r r r r r r r } \text { Output } & 0 & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\\text { Total Cost } & 10 & 11 & 13 & 16 & 20 & 25 & 31 & 38 & 48\end{array}$$

A) 20
B) 4
C) 5
D) 2.5