I think it's D but don't take me on that because it's a high school question and i'm in middle school lol.
Answer:
The St. Lawrence Seaway connects the Atlantic Ocean with the Great Lakes.
Explanation:
St. Lawrence Sea is a long waterway near the Northeastern border of America that connects from the Atlantic Ocean into the Great Lakes. It has allowed for shipping vessels to come through. However, these ships sometimes bring invasive species such as the Sea Lamprey.
Oops I wanted to help but sorry