The cap structure on a $\frac{5}{1}$ ARM is stated as $\text{'}\frac{2}{2}\frac{?}{6}\text{'}.$ According to the interest rate index this ARM follows, the rate will rise by $2\%$ in year $6,$ by another $2\mathrm{.}5\%$ in year $7,$ by another $2\%$ in year $8.$ let's say the fixed rate was $3\mathrm{.}5\%.$ What interest rate would be for year $8?$

A$.5\mathrm{.}5\%$

C$.8\%$

E$.9\mathrm{.}5\%$

D$.8\mathrm{.}5\%$

B$.7\mathrm{.}5\%$