The correct answer is C) 18.6 nm. The explanation is as follows: 1. The correct answer is C) 18.6 nm. This is the approximate geographic range of Point Judith Light, Rhode Island, with a height of eye of 62 feet (18.9 meters). 2. The formula to calculate the geographic range of a light is: Range (in nautical miles) = 2.2 x √height of eye (in feet). Using this formula, the range for a height of eye of 62 feet is 2.2 x √62 = 18.6 nm, which is the correct answer. 3. The other options are incorrect because they do not match the calculated range of 18.6 nm. Option A) 9.6 nm and Option B) 16.5 nm are too low, while Option D) 20.7 nm is too high. 4. The provided "charted range of 20 miles as nominal range" is a general guideline, but the calculated range of 18.6 nm is the more accurate value based on the given height of eye.