Suppose a stock has a beta of $1\mathrm{.}3,$ the risk$-$free rate is $6\mathrm{.}0\%,$ and the market risk premium is $4\mathrm{.}5\%.$ If the stock's beta falls to $1\mathrm{.}0$ but the other two variables remain unchanged, by how much would the stock's required rate of return decline?

a$.0\mathrm{.}62\%$

b$.1\mathrm{.}35\%$

c$.0\mathrm{.}88\%$

d$.1\mathrm{.}71\%$

e$.2\mathrm{.}28\%$