To accurately represent a map of the Silk Road, you would want to include the Arabian Peninsula. The Silk Road was a network of trade routes that connected the East and West, primarily linking regions in Asia with parts of Europe and the Mediterranean. The Arabian Peninsula played a significant role in facilitating trade and cultural exchange along these routes.
The other options—Cape of Good Hope, northern Europe, and the Atlantic Ocean—are not directly related to the primary routes of the Silk Road.