Among the following, which is closest to $\sqrt{0.016}$? Among the following, which is closest in value to $\sqrt{0.016}$?
A. $0.4$
B. $0.04$
C. $0.2$
D. $0.02$
E. $0.13$
My Approach:
$(\frac{16}{1000})^\frac{1}{2} = (\frac{4}{250})^\frac{1}{2} = \frac{2}{5\cdot\sqrt{10}} = \frac{\sqrt{2}}{5\cdot\sqrt{5}}$ 
But I don't know how to reach to answer.
Thank You!

Though squaring each and checking works equally as well, here's another way to figure it out:
$$
\sqrt{0.016}=\frac{\sqrt{1000}}{\sqrt{1000}}\sqrt{0.016}=\frac{\sqrt{16}}{\sqrt{1000}}=\frac{4}{\sqrt{1000}}\approx\frac{4}{\sqrt{1024}}=\frac{4}{\sqrt{2^{10}}}=\frac{4}{2^{5}}=\frac{4}{32}=\frac{1}{8}=0.125
$$
