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A cereal company wants to enlarge the volume of the cylindrical container used for one of its products by enlarging the radius of the cylinder. The height must be $20$ centimeters. The new volume of the cylinder is given by the equation $V(x)=20 \pi(5+x)^{2}$. where $x$ is the additional length of the radius in centimeters. Which of the following equivalent expressions displays the current volume of the cylinder as a constant or coefficient?$\newline$Choose $1$ answer:$\newline$(A) $\pi\left(20 x^{2}+200 x+500\right)$$\newline$(B) $20 \pi\left(x^{2}+10 x+10\right)+300 \pi$$\newline$(c) $20 \pi\left(x^{2}+10 x+25\right)$$\newline$(D) $20 \pi x^{2}+200 \pi x+500 \pi$