The geography of both North and South are described in option (B): "long coastline from the Atlantic to the Gulf of Mexico". So, option (B) is the correct answer,
Mainland North America is approximately formed like a triangle, with its base in the north and in the south; Greenland, the world's biggest island, is related with the continent.
The Arctic Ocean borders North America on the north, the Caribbean Sea on the south, the North Pacific Ocean on the west, and the North Atlantic Ocean on the east.
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