A bond has a Modified duration of $6\mathrm{.}3$ years and a convexity of $103\mathrm{.}1.$ Interest rates are currently constant at $9\mathrm{.}3\%.$ There is a $35\%$ chance of interest rates increasing to $13\mathrm{.}1\%,$ a $54\%$ chance of interest rates staying constant, and a $11\%$ chance of interest rates decreasing to $7\mathrm{.}9\%.$ Under this scenario, which answer below is the closest to the standard deviation of bond returns?