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Correct Answer: A: Mariana Trench
Explanation: The correct answer is Mariana Trench, as it is the deepest part of the ocean, with a depth of approximately 11,000 meters. The Mariana Trench has been a subject of interest for scientists and explorers, with many expeditions attempting to reach its bottom. Options like Great Barrier Reef, Mid-Atlantic Ridge, and Gulf of Mexico are incorrect because they are not the deepest parts of the ocean. The Mariana Trench is also home to unique marine life that can survive in extreme conditions. This fact is essential for geography and can be found in FPSC, NTS, and CSS exams, which often test candidates' knowledge of basic geographical facts.
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