The Following Data Show the Relationship Between the Number of Drivers

The following data show the relationship between the number of drivers who leave for work at 8:00 am,their average commute times,and their marginal benefit associated with the commute times. $$\begin{array} { c c c } \begin{array} { c } \text { Number of drivers } \\ \underline {\text { that leave at 8:00am }}\end{array} & \begin{array} { c } \text { Average commute } \\ \underline {\text { time to downtown }}\end{array} & \begin{array} { c } \text { Marginal } \\ \underline {\text { Benefit }}\end{array} \\ 100 & 30 \text { minutes } & \$ 10 \\200 & 65 \text { minutes } & \$ 8 \\300 & 110 \text { minutes } & \$ 4 \\400 & 170 \text { minutes } & \$ 3 \\500 & 260 \text { minutes } & \$ 1\end{array}$$
Refer to the information given above.The reason drivers would prefer building new roads to a $5 toll to reduce commute times is because:

A) building roads is the only cost-effective solution.
B) they know a toll would not alter commuting behavior.
C) a tax solves the commitment problem.
D) the cost of new roads falls on all taxpayers;the toll only falls on those who use the existing road.