You are given the following forward rates:

Find $s_4.$

$($A$)3\mathrm{.}92\%$

$($B$)4\mathrm{.}05\%$

$($C$)4\mathrm{.}17\%$

$($D$)4\mathrm{.}31\%$

$($E$)4\mathrm{.}46\%$