The correct option is "Only two" because Finland and Germany have coastlines along the North Sea, while Norway and Russia do not share direct borders with it. Norway's coastline abuts the North Atlantic Ocean, and while it is geographically close to the North Sea, it does not have direct access. Russia, on the other hand, has coastlines on the Arctic Ocean and other seas but is not adjacent to the North Sea. Understanding the geographical boundaries and maritime delineations is crucial in UPSC Prelims, where questions often test candidates' knowledge of international borders and regional geographies.