(Table) Based on the Table, Assume That a Bottle of Water

(Table) Based on the table, assume that a bottle of water costs $2. The marginal utility per dollar for the third bottle of water is
$\begin{array}{l}\hline \quad \quad \quad {\text { Bottled Water }} \quad \quad \quad \quad \quad \quad \quad {\text { Bags of Chips }} \\\begin{array}{|c|c|c|c|}\hline \text { Quantity } & \text { Total Utility } & \text { Quantity } & \text { Total Utility } \\\hline 0 & 0 & 0 & 0 \\\hline 1 & 40 & 1 & 60 \\\hline 2 & 70 & 2 & 90 \\\hline 3 & 90 & 3 & 105 \\\hline 4 & 100 & 4 & 114 \\\hline 5 & 106 & 5 & 120 \\\hline\end{array}\end{array}$

A) 20.
B) 10.
C) 15.
D) 5.