If x = ( 0.25 )^1/2, y = ( 0.4 )^2, z = ( 0.216 )^1/2 then-

Answer: Option D

$$\begin{array}{rl}& x={\left(0.25\right)}^{\frac{1}{2}}\\ & x=\text{root}2\text{of}0.25=0.5\\ & y={\left(0.4\right)}^2\\ & y=0.16\\ & z={\left(0.216\right)}^{\frac{1}{2}}\\ & z=\text{root}2\text{of}0.216=0.464\\ & \therefore x>z>y\end{array}$$