An investor buys a Treasury bill maturing $1$ month for Rs$.987.$ On the maturity date the investor collects Rs$.1000.$ Calculate Effective Annual Rate $($EAR$).$

A$.17\mathrm{.}0\%$

B$.\frac{15}{8}\%$

C$.13\mathrm{.}0\%$

D$.11\mathrm{.}6\%.$