Answer: Option B
$$\eqalign{
& \,\,\,\,\,\,\,1|\overline 1 \,.\,\overline {56} \,\,\overline {25} \,(1.25 \cr
& \,\,\,\,\,\,\,\,\,\,|1 \cr
& \,\,\,\,\,\,\,\,\,\,| - - - - - - - - \cr
& \,\,\,22|\,\,\,\,\,\,56 \cr
& \,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,44 \cr
& \,\,\,\,\,\,\,\,\,\,| - - - - - - - - \cr
& 245\,|\,\,\,\,\,\,\,12\,25 \cr
& \,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,12\,25 \cr
& \,\,\,\,\,\,\,\,\,\,| - - - - - - - \cr
& \,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\text{x} \cr
& \,\,\,\,\,\,\,\,\,\,| - - - - - - - \cr
& \therefore \sqrt {1.5625} = 1.25 \cr} $$