The correct answer is A) Light Lists. The Light Lists are one of the nautical texts published by the U.S. Coast Guard. These publications provide information on navigational aids, such as lighthouses, buoys, and other fixed and floating aids, that assist mariners in navigating U.S. coastal waters. The Light Lists are considered an essential reference for Coast Guard Captain's License examinations, as knowledge of navigational aids is critical for safe vessel operations. The other options, U.S. Coast Pilots and Radio Navigational Aids, are also important nautical references, but they are not published by the U.S. Coast Guard. The U.S. Coast Pilots are published by the National Oceanic and Atmospheric Administration (NOAA), while the Radio Navigational Aids are published by the National Imagery and Mapping Agency (NIMA).