The required return for Williamson Heating's stock is $12\%,$ and the stock will sell for GHS $40$ per share in $4$ years. The firm just paid a dividend of GHS$1\mathrm{.}00,$ and the dividend is expected to grow by $30\%$ per year for the next $4$ years, so D$4=$ GHS $1\mathrm{.}00(1\mathrm{.}30)4=$ GHS $2\mathrm{.}8561.$ After t $=4,$ the dividend is expected to grow at a constant rate of X$\%$ per year forever. What is the stock's expected constant growth rate after t $=4,$ i$.$e$.,$ what is X$?$

A$.14\mathrm{.}7\%$ B$.17\%$ C$.11\mathrm{.}2\%$ D$.4\mathrm{.}9\%$