(Table) the Table Shows Total and Marginal Utilities of Vacation

(Table) The table shows total and marginal utilities of vacation trips taken. Based on the table, we can conclude that
$\begin{array}{|c|c|c|}\hline \text { Trips } & \text { Total Utility } & \text { Marginal Utility } \\\hline 0 & 0 & - \\\hline 1 & 5 & 5 \\\hline 2 & 9 & 4 \\\hline 3 & 11 & 2 \\\hline 4 & 12 & 1 \\\hline\end{array}$

A) we cannot predict how many trips will be taken because we do not know income or prices.
B) total utility is maximized when one trip is taken.
C) the vacationer will take three trips.
D) the vacationer will take four trips.