Answer: Option B
$$\eqalign{
& {\text{0}}{\text{.7 + }}\sqrt {0.16} = 0.7 + 0.4 \cr
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 1.1 \cr
& 1.02 - \frac{{0.6}}{{24}} = 1.02 - 0.025 \cr
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 0.995 \cr
& 1.2 \times 0.83 = 0.996 \cr
& \sqrt {1.44} = \sqrt {\frac{{144}}{{100}}} \cr
& \,\,\,\,\,\,\,\,\,\,\,\,\,\, = \frac{{12}}{{10}} \cr
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 1.2 \cr
& {\text{ So }}\sqrt {1.44} {\text{ is the greatest}}{\text{.}} \cr} $$