Which body of water is located to the south of Hudson Bay?

The Great Lakes are the correct answer because they are a group of large freshwater lakes located to the south of Hudson Bay, which is situated in northern Canada. The Great Lakes, which include Lakes Superior, Michigan, Huron, Erie, and Ontario, form part of the border between Canada and the United States. This geographical relationship makes it clear that the Great Lakes are adjacent to Hudson Bay's southern area.

In contrast, the Atlantic Ocean is located to the southeast of Hudson Bay, while the Pacific Ocean is situated to the southwest and is not directly related to the northern Canadian landscape around Hudson Bay. The Arctic Ocean lies to the north of Hudson Bay, and thus is not relevant to its southern boundary. Therefore, the proximity and geographical positioning of the Great Lakes make them the most accurate choice in this context.