Answer
Option B - The Korean Strait and The Sea of Japan.
Explanation
The Korea Strait is a sea passage between South Korea and Japan which connects the East China Sea, the Yellow Sea (also known as West Sea) and the Sea of Japan (also known as East sea) in the northwest Pacific Ocean. The Sea of Japan is the marginal sea between the Japanese archipelago, Sakhalin, the Korean Peninsula, and Russia. It is bordered by Japan, Korea, and Russia.