What island is situated 1.5 miles southwest of Horse Island?

The correct choice, Bass Island, is accurately situated approximately 1.5 miles southwest of Horse Island in Lake Ontario. This positioning is significant as it highlights the island's proximity to other landmarks in the area, which is important for navigation and local geography. Knowing the relationships between these islands is essential for boaters and those involved in maritime activities around Lake Ontario, as it helps in planning routes and understanding local topography.

The other islands mentioned, while they may be present in the Lake Ontario area, do not share the described proximity to Horse Island. Simcoe Island is located further away, while both Great Duck Island and Hovey Island are also situated at distances that do not coincide with the specified 1.5-mile marker from Horse Island. Understanding the specific locations of these islands in relation to one another enhances a person's awareness and knowledge of the region, which is vital for safe navigation and exploration.