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Choice D is correct. The area of a circle can be found by using the formula $A=\pi r^2$, where $A$ is the area and $r$ is the radius of the circle. It’s given that the radius of circle A is $3n$. Substituting this value for $r$ into the formula $A=\pi r^2$ gives $A=\pi {\left(3n\right)}^2$, or $9\pi n^2$. It’s also given that the radius of circle B is $129n$. Substituting this value for $r$ into the formula $A=\pi r^2$ gives $A=\pi {\left(129n\right)}^2$, or $\mathrm{16,641}\pi n^2$. Dividing the area of circle B by the area of circle A gives $\frac{\mathrm{16,641}\pi n^2}{9\pi n^2}$, which simplifies to $\mathrm{1,849}$. Therefore, the area of circle B is $\mathrm{1,849}$ times the area of circle A.

Choice A is incorrect. This is how many times greater the radius of circle B is than the radius of circle A.

Choice B is incorrect and may result from conceptual or calculation errors.

Choice C is incorrect. This is the coefficient on the term that describes the radius of circle B.