A. In Black Sea

B. In Yellow Sea

C. In Mediterranean Sea

D. In South China Sea

Brief Facts about Mariana Trench:

Mariana Trench is the deepest place in the ocean. It is located in the Western Pacific Ocean and in the South China Sea near the Mariana Island. Moreover,  It is a crescent-shaped trench and measures about 2,550 km (1,580 Miles) in length and almost 69 km (43 Miles) in width. The maximum known depth is 10,984 ± 30 meters.

Depth of Mariana Trench
Depth of Mariana Trench