The historical returns for the past three years for Stock B and the stock market portfolio are: Stock B: $24\%,0\%,24\%$; Market portfolio: $10\%,12\%,20\%.$ Calculate the beta for Stock B$.$ A$.1\mathrm{.}13$ B$.1\mathrm{.}00$ C$.0\mathrm{.}86$ D$.1\mathrm{.}17$