89. At 1200, your position is 2.0 miles southwest of Bartlett Reef Light. Your heading is 075°T. Visibility is less than 0.2 mile in fog and rain. Which of the following signals is most likely to be from another vessel?

A sound at 330 relative is likely from Bartlett Reef Light, which uses a horn. Therefore, a whistle at 075 relative is most likely from another vessel, as whistles are standard signals for underway vessels in restricted visibility and are located away from charted aids.