To estimate the average distance from the Sun for Uranus, we can look at the distances of Saturn and Neptune, which are 9.5 AU and 30 AU, respectively. Since Uranus is between Saturn and Neptune, we can take an average of these two distances to get a reasonable estimate.
Calculating the average:
\[ \text{Average distance} = \frac{9.5 + 30}{2} = \frac{39.5}{2} = 19.75 \text{ AU} \]
Since 19.75 is close to 20 AU, the most reasonable estimate from the given options for the distance from Uranus to the Sun is:
20 AU