Final answer:
The 4. Hudson Bay is not located along Canada's coasts; it is an inland sea connected to the Atlantic Ocean, unlike the Beaufort Sea, Gulf of St. Lawrence, and the Arctic Ocean, which directly border Canada's coasts.
Step-by-step explanation:
The body of water from the provided options that is not located along Canada's coasts is the 4. Hudson Bay. The Hudson Bay is an inland sea that is linked to the Atlantic Ocean through the Hudson Strait. The Beaufort Sea, Gulf of St. Lawrence, and the Arctic Ocean all border Canada's coasts directly.
The Beaufort Sea is part of the Arctic Ocean, located in the north of Canada and Alaska. The Gulf of St. Lawrence is connected to the Atlantic Ocean and is located east of Canada, surrounded by Newfoundland and mainland Canada.
The Arctic Ocean lies to the north of Canada and includes several large Canadian islands such as Baffin Island and Ellesmere Island. In contrast, the Hudson Bay, though it is connected to the sea via the Hudson Strait, is not considered to be located "along" Canada's coast as it is more centrally located within the mainland's boundaries.