Concept:The Mariana Trench is the deepest oceanic trench on Earth, located in the western Pacific Ocean.
Explanation:The Mariana Trench lies on the floor of the western Pacific Ocean, east and south of the Mariana Islands.
It was first measured in 1875 during the Challenger Expedition.
The trench formed by the convergence of two oceanic plates, a process that creates deep-sea trenches.
In contrast, the South Sandwich Trench is in the South Atlantic, the Kermadec Trench is in the South Pacific, and the Atacama Trench is in the eastern Pacific.
This geographic context confirms that the Mariana Trench belongs to the western Pacific Ocean.
Answer:Western Pacific Ocean (Option B).
