Answer:
The Great Lakes and surrounding area is a natural resource of great importance in North America. The region also serves as the focal point of the industrial and agricultural base of the Midwest's heartland by providing a strong marine transportation system.
United Kingdom has the largest navy due to the fact that the country is surrounded by water and ocean, while all the other countries on the list here are landlocked countries with no adjacent major body of water.
D is the answer to the question.
Glasgow, Edinburgh, Stirling, Perth and Dundee all lie in the Central Lowlands, and over half of Scotland's population lives in this region
