Canada is one, and the only nation out of the provided choices, which is least likely to guard the Gulf of Mexico in the American continent. Therefore, the option D holds true.
Gulf of Mexico is situated towards the middle of the Southern and Northern America. It is more located near the Caribbean Islands. It shares its borders with the United States towards its Northeast, and is covered by ocean to its all other directions.
Canada is a nation that is located towards the North of the United States, which is completely different from the borders of the Gulf of Mexico. Thus, Canada is one such nation that is least likely to guard the Gulf of Mexico.
Therefore, the option D holds true regarding the Gulf of Mexico.
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