While other cities are located farther north, Reykjavik is the northernmost national capital city and it is the capital of Iceland .
A. Reykjavik is the northernmost national capital city and it is the capital of Iceland
B. the capital of Iceland, Reykjavik is the northernmost national capital city
C. of national capital cities, Reykjavik, the capital of Iceland, is the northernmost
D. Reykjavik, the capital of Iceland, is the northernmost national capital city
E. Reykjavik, the northernmost national capital city, is the capital of Iceland

OA is D