The value of ( 0.03125 )^ - 2/5 is = ?

Answer: Option A

$$\begin{array}{rl}& {\left(0.03125\right)}^{-\frac{2}{5}}\\ & ={\left[{\left(0.5\right)}^5\right]}^{-\frac{2}{5}}\\ & =0.5^{\left[5\times \left(-\frac{2}{5}\right)\right]}\\ & ={\left(0.5\right)}^{-2}\\ & =\frac{1}{{\left(0.5\right)}^2}\\ & =\frac{1}{0.25}\\ & =4\end{array}$$