Table 65 -Refer to Table 6

Table 6.5
$$\begin{array} { | c | c | } \hline \text { Plums } & \text { Total Utility } \\\hline 0 & 0 \\\hline 1 & 10 \\\hline 2 & 18 \\\hline 3 & 24 \\\hline 4 & 28 \\\hline 5 & 30 \\\hline\end{array}$$
-Refer to Table 6.5,which shows the total utility and marginal utility derived from the consumption of plums.The first column of the table shows the number of plums a consumer consumes in a day,and the second column shows the total utility derived from that consumption.The marginal utility of the first plum is _____

A) 4 units.
B) 6 units.
C) 8 units.
D) 10 units.
E) 24 units.