Expand the Indicated Expression $(1+2 \sqrt{5 x})^{2}$ A) $1+20 x+2 \sqrt{5 x}$

Expand the indicated expression. $(1+2 \sqrt{5 x}) ^{2}$

A) $1+20 x+2 \sqrt{5 x}$
B) $1+20 x+\sqrt{5 x}$
C) $1+20 x+4 \sqrt{5 x}$
D) $1-20 x+4 \sqrt{5 x}$