Assuming that Alternatives \( B \) and \( C \) are replaced with identical units at the end of their useful lives, and an \( 8 \% \) interest rate, which alternative should be selected? Use an annual cash flow analysis.
\begin{tabular}{||l||l||l||l||}
\hline & \( A \) & \( B \) & \( C \) \\
\hline cost & \( \$ 12,500 \) & \( \$ 15,000 \) & \( \$ 17,500 \) \\
\hline Annual benefit & 1,500 & 3,500 & 2,500 \\
\hline useful life (yrs) & \( \infty \) & 7 & 15 \\
\hline
\end{tabular}