(0.04)-1.5 = ?

Answer: Option B

$$\begin{array}{rl}& {\left(0.04\right)}^{-1.5}={\left(\frac{4}{100}\right)}^{-1.5}\\ & ={\left(\frac{1}{25}\right)}^{-\left(3/2\right)}\\ & ={\left(25\right)}^{\left(3/2\right)}\\ & ={\left(5^2\right)}^{\left(3/2\right)}\\ & ={\left(5\right)}^{2\times \left(3/2\right)}\\ & =5^3\\ & =125\end{array}$$