The correct answer is option 4: Arctic. The Arctic Ocean is the smallest ocean in the world. It is located in the northernmost part of the Earth and is bordered by several countries including Russia, Canada, Greenland, Norway, and the United States. The Arctic Ocean covers an area of about 14 million square kilometers, making it the smallest of all the oceans. It is characterized by its cold temperatures and ice-covered surface, especially during the winter months. The Arctic Ocean plays a significant role in regulating the Earth`s climate and is home to various species of marine life, including polar bears, walruses, and seals.