0.0196? = 0.2

Answer: Option A

$$\begin{array}{rl}& \text{Let ,}\\ & \sqrt{\frac{0.0196}{x}}=0.2\\ & \text{Then,}\\ & \iff \frac{0.0196}{x}=0.04\\ & \iff x=\frac{0.0196}{0.04}\\ & \iff x=\frac{1.96}{4}\\ & \iff x=0.49\end{array}$$