Correct Option
- Black Sea - Bulgaria: Bulgaria is situated on the western coast of the Black Sea. Other littoral states include Romania, Ukraine, Russia, Georgia, and Turkey.
- Red Sea - Eritrea: Eritrea has an extensive coastline along the western shore of the Red Sea, bordering Sudan to the north and Djibouti to the south.
- Yellow Sea - China: The Yellow Sea is an arm of the Pacific Ocean located between mainland China and the Korean Peninsula. China's eastern coast, including major cities like Qingdao, borders this sea.
- Caspian Sea - Kazakhstan: Kazakhstan is one of the five littoral states of the Caspian Sea, the world's largest inland body of water. Its coastline is along the northeastern part of the sea, shared with Russia, Azerbaijan, Iran, and Turkmenistan.
Incorrect Options
Options (a), (b), and (d) contain incorrect pairings. For example, China borders the Yellow Sea, not the Red Sea, and Eritrea borders the Red Sea, not the Yellow Sea. These options present geographical inaccuracies regarding the countries bordering the specified seas.