(Table) Which of the Tables Indicates the Correct Marginal Utilities

(Table) Which of the tables indicates the correct marginal utilities in the completed table?
$\begin{array}{|c|c|c|}\hline \begin{array}{c}\text { Gallons of } \\\text { Gas }\end{array} & \text { Total Utility } & \text { Marginal Utility } \\\hline 0 & 0 & \\\hline 1 & 40 & \\\hline 2 & 70 & \\\hline 3 & 95 & \\\hline 4 & 116 & \\\hline 5 & 136 & \\\hline\end{array}$

A)
$\begin{array}{|c|c|c|}\hline \begin{array}{c}\text { Gallons of } \\\text { Gas }\end{array} & \text { Total Utility } & \text { Marginal Utility } \\\hline 0 & 0 & - \\\hline 1 & 40 & 20 \\\hline 2 & 70 & 21 \\\hline 3 & 95 & 25 \\\hline 4 & 116 & 30 \\\hline 5 & 136 & 40 \\\hline\end{array}$
B)
$\begin{array}{|c|c|c|}\hline \begin{array}{c}\text { Gallons of } \\\text { Gas }\end{array} & \text { Total Utility } & \text { Marginal Utility } \\\hline 0 & 0 & - \\\hline 1 & 40 & 45 \\\hline 2 & 70 & 30 \\\hline 3 & 95 & 25 \\\hline 4 & 116 & 20 \\\hline 5 & 136 & 15 \\\hline\end{array}$
C)
$\begin{array}{|c|c|c|}\hline \begin{array}{c}\text { Gallons of } \\\text { Gas }\end{array} & \text { Total Utility } & \text { Marginal Utility } \\\hline 0 & 0 & - \\\hline 1 & 40 & 35 \\\hline 2 & 70 & 30 \\\hline 3 & 95 & 20 \\\hline 4 & 116 & 15 \\\hline 5 & 136 & 11 \\\hline\end{array}$
D)
$\begin{array}{|c|c|c|}\hline \begin{array}{c}\text { Gallons of } \\\text { Gas }\end{array} & \text { Total Utility } & \text { Marginal Utility } \\\hline 0 & 0 & - \\\hline 1 & 40 & 40 \\\hline 2 & 70 & 30 \\\hline 3 & 95 & 25 \\\hline 4 & 116 & 21 \\\hline 5 & 136 & 20 \\\hline\end{array}$