of the four annuities are shown in the following table, $.$

a$.$ Calculate the rate of return on each of the four annuities Raina is considering.

b$.$ Given Raina's stated decision criterion, which annuity would you recommend?

a$.$ The rate of return, $r,$ on annuity $A$ is $\%.($Round to two decimal places.$)$

Data table

$($Click on the icon here $$ in order to copy the contents of the data table below into a spreadsheet.$)$

$\backslash$table$[[$Annuity$,$Premium paid today,Annual benefit,Life $($years$)],[$A$,$$$30,393\mathrm{.}26,$$$3,200,20],[$B$,$$$22,813\mathrm{.}24,$$$3,700,10],[$C$,$$$36,482\mathrm{.}69,$$$4,200,15],[$D$,$$$30,736\mathrm{.}78,$$$3,800,12]]$