Question $23(2\mathrm{.}5$ points$)$

Tamara is a $55-$year$-$old widow with no source of income. Her husband just died and she has received insurance proceeds from a policy on his life. She wants to invest in an annulty that will produce income starting today and continuing until she plans to collect Social Security, at age $65.$ She wants to reteive the most she can in monthly income. Which of the following is the most suitable annuity for Tamara based on her objectives?

$15$

$18$

$$

$21$