The correct answer is D. The South China Sea.
Step-by-step explanation
The image shows the eastern part of the Asian continent; on it are also the letters W, X, Y, and Z. In the case of the letter X, it represents the South China Sea is a sea of the Pacific Ocean that is located in the coastal zone of southeastern China, which encompasses the area limited by the East Asian coast, from Indonesia and Malaysia to the Taiwan Strait, and the islands of Borneo and the archipelago of the Philippines, its total area is approximately 3,500,000 km². This sea is characterized by being the place of small islands in the Eastern Sea, which are grouped into archipelagos.