The correct answer is A) is a western quadrant buoy. According to the U.S. Aids to Navigation System, a buoy that is a western quadrant buoy (i.e., located in the western part of a channel) indicates that the best navigable water is to the buoy's left, or port side, when approaching it. This means that if you sight a buoy broad on your port bow, you are in the best navigable water if the buoy is a western quadrant buoy. The other answer choices do not provide sufficient information to determine the best navigable water in relation to the buoy's position. The type of topmark, color pattern, and light characteristic alone do not indicate the buoy's position within the channel.