Please help, I'm so confused.

For each of the following cases, indicate (a) what interest rate columns and (b) what number of periods you would refer to in looking up the discount rate. (Round percentages to 1 decimal place, e.g. 15.1\%.) (1) In Table 3 (future value of 1): \begin{tabular}{|c|c|c|c|c|} \hline & Annual Rate & \begin{tabular}{c} Number of \\ Years Involved \end{tabular} & \begin{tabular}{c} Number of \\ Payments Involved \end{tabular} & \begin{tabular}{c} Frequency of \\ Payments \end{tabular} \\ \hline Case A & 8% & 19 & 19 & Annually \\ \hline Case B & 8% & 5 & 5 & Annually \\ \hline Case C & 10% & 5 & 10 & Semiannually \\ \hline \end{tabular} (a) Case A Case B (b) % periods periods periods Case C %