(Table: Public Goods) the Table Shows the Number of Acres

(Table: Public Goods) The table shows the number of acres of a public park that four residents demand at different willingness-to-pay levels. The total willingness to pay for 4 acres is
$\begin{array}{|c|c|c|c|c|}\hline P & Q_{1} & Q_{2} & Q_{3} & Q_{4} \\\hline 0 & 7 & 10 & 5 & 4 \\\hline 1 & 6 & 9 & 4 & 3 \\\hline 2 & 5 & 8 & 3 & 2 \\\hline 3 & 4 & 7 & 2 & 1 \\\hline 4 & 3 & 6 & 1 & 0 \\\hline 5 & 2 & 5 & 0 & 0 \\\hline 6 & 1 & 4 & 0 & 0 \\\hline 7 & 0 & 3 & 0 & 0 \\\hline 8 & 0 & 2 & 0 & 0 \\\hline 9 & 0 & 1 & 0 & 0 \\\hline 10 & 0 & 0 & 0 & 0 \\\hline\end{array}$

A) $10.
B) $14.
C) $18.
D) $22.