Answer: B. the North Atlantic Drift.
The North Atlantic Drift or North Atlantic Current is a powerful warm current in the Atlantic Ocean. The current originates where the Gulf Streams turns north at the Southeast Newfoundland Rise. From there, it flows northward before turning sharply east across the Atlantic. This current is responsible for transporting warm tropical water to northern latitudes. Therefore, it significantly affects the weather of Western Europe by making it significantly warmer than that of Eastern Europe.
