Answer:
The Yellow Sea
The west coast of the peninsula is bordered by the Korea Bay to the north and the Yellow Sea and Korea Strait to the south; the east coast is bordered by the Sea of Japan.
Explanation:
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The best and most correct answer among the choices provided by your question is the third choice.
The oceanic trenches<span> are hemispheric-scale long but narrow topographic depressions of the sea floor. They are also the deepest parts of the </span>ocean<span> floor.</span>
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subtract 8 from both sides leaving

combine -2x+-8x =-10x

divide both sides by ten