(Figure: Externality Table I) the Table Shows the Information for a Public

Multiple Choice

(Figure: Externality Table I) The table shows the information for a public good being provided to two citizens. Based on the table, what is the equilibrium quantity?
$\begin{array}{|r|r|r|r|}\hline \text { Q } & \text { Ann's MPB } & \text { Ben's MPB } & \text { MSC } \\\hline 1 & \$ 10 & \$ 12 & 1 \\\hline 2 & 8 & 9 & 3 \\\hline 3 & 6 & 6 & 5 \\\hline 4 & 4 & 3 & 7 \\\hline 5 & 2 & 0 & 9 \\\hline 6 & 0 & 0 & 11 \\\hline 7 & 0 & 0 & 13\\\hline\end{array}$

A) 1
B) 4
C) 5
D) 7