The correct answer is option 4, Pacific. The Pacific Ocean is the largest and deepest ocean in the world and it is the ocean that touches both the Asian and American shores. It stretches from the east coast of Asia to the west coast of the Americas, covering a vast area. The Atlantic Ocean (option 1) is located between the Americas and Europe/Africa. The Indian Ocean (option 2) is located to the south of Asia, between Africa and Australia. The Antarctic Ocean (option 3) is a term used to refer to the waters surrounding Antarctica. Therefore, the only option that correctly identifies the ocean touching both the Asian and American shores is the Pacific Ocean.