Trench is the deepest part of the ocean.
Ocean trench
Oceanic trench, also known as deep-sea trench. It is the narrow, long, steep-sided depression in the bottom of the ocean in which take place the maximum oceanic depths.
It is about of the depth of 7300 to 11000 meters, that is, 24000 to 36000 feet.
They generally emerge in the locations where subduction of one tectonic plate takes place over the other.
The deepest place in the ocean is the Mariana trench, which is of the depth of 36201 feet.
Thus, the correct answer is trench.
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