One of two alternatives will be selected to reduce flood damage in a rural community in central Arizona. The estimates associated with

each alternative are available. Use B$/$C analysis at a discount rate of $10\%$ per year over a $20-$year study period to determine which

alternative should be selected. For analysis purposes only, assume that the benefits of reduced flood damage are available in years $6,$

$11,$ and $18$ of the study period.

The $\frac{B}{C}$ ratio is

The alternative that should be selected is the retention pond $v.$