Which of the following stocks is the best selection for a single stock portfolio?StockSan DiegoAmmanLondonO LondonO San DiegoAmmanBetaSancard Deviation$0\mathrm{.}4227\mathrm{.}0\%0\mathrm{.}7518\mathrm{.}0\%1\mathrm{.}314\mathrm{.}0\%$ tither Amman OR Londoni