Nadia bought a compass and after opening its package realized that the length of the needle leg is $10$ centimeters whereas the length of the pencil leg is $16$ centimeters! Assume that in order to draw a circle with this compass, the angle between the pencil leg and the paper must be at least $30$ degrees but the needle leg could be positioned at any angle with respect to the paper. Let $n$ be the difference between the radii of the largest and the smallest circles that Nadia can draw with this compass in centimeters. Which of the following options is closest to $n$?

$\textbf{(A)}\ 6\qquad\textbf{(B)}\ 7\qquad\textbf{(C)}\ 10 \qquad\textbf{(D)}\ 12\qquad\textbf{(E)}\ 20$
1. **Determine the largest radius:**
   - The largest radius occurs when the pencil leg makes a $30^\circ$ angle with the paper.
   - The length of the pencil leg is $16$ cm.
   - The effective radius is given by the horizontal projection of the pencil leg, which is $16 \cos(30^\circ)$.
   - Using $\cos(30^\circ) = \frac{\sqrt{3}}{2}$, we get:
     \[
     \text{Largest radius} = 16 \cos(30^\circ) = 16 \cdot \frac{\sqrt{3}}{2} = 8\sqrt{3}
     \]

2. **Determine the smallest radius:**
   - The smallest radius occurs when the pencil leg is perpendicular to the paper, making a $90^\circ$ angle.
   - The length of the needle leg is $10$ cm.
   - The effective radius is given by the horizontal projection of the pencil leg minus the horizontal projection of the needle leg.
   - The horizontal projection of the pencil leg is $16 \cos(90^\circ - 30^\circ) = 16 \sin(30^\circ)$.
   - Using $\sin(30^\circ) = \frac{1}{2}$, we get:
     \[
     \text{Smallest radius} = 16 \sin(30^\circ) - 10 \cos(30^\circ) = 16 \cdot \frac{1}{2} - 10 \cdot \frac{\sqrt{3}}{2} = 8 - 5\sqrt{3}
     \]

3. **Calculate the difference between the largest and smallest radii:**
   - The difference $n$ is given by:
     \[
     n = 8\sqrt{3} - (8 - 5\sqrt{3}) = 8\sqrt{3} - 8 + 5\sqrt{3} = 13\sqrt{3} - 8
     \]

4. **Approximate the value of $n$:**
   - Using $\sqrt{3} \approx 1.732$, we get:
     \[
     n \approx 13 \cdot 1.732 - 8 = 22.516 - 8 = 14.516
     \]

5. **Compare with the given options:**
   - The closest option to $14.516$ is $\boxed{12}$.