0.081 × 0.4840.0064 × 6.25 is equal to ?

Answer: Option B

Sum of decimal places in the numerator and denominator under the radical sign being the same, we remove the decimal.
∴ Given expression,
$$\begin{array}{rl}& =\sqrt{\frac{0.081\times 0.484}{0.0064\times 6.25}}\\ & =\sqrt{\frac{81\times 484}{64\times 625}}\\ & =\frac{9\times 22}{8\times 25}\\ & =0.99\end{array}$$