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A
The Atlantic Ocean
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B
The Pacific Ocean
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C
The Indian Ocean
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D
The Arctic Ocean
Why this is the answer
The PACIFIC OCEAN borders the West Coast of the United States — including the states of California, Oregon, Washington, Alaska, and Hawaii. The ATLANTIC OCEAN borders the East Coast. The GULF OF MEXICO borders parts of the South (Texas, Louisiana, Mississippi, Alabama, Florida). USCIS Question 88 (65/20 list): 'Name one of the two longest rivers in the United States' — separate question. 'What ocean is on the West Coast of the United States?' is typically covered in geography questions. Answer: Pacific (Ocean).
Source: USCIS Civics — US Geography, Pacific Ocean