Final answer:
Option A.
The Southern Ocean begins at the latitude of 60° S and is characterized by the marine conditions of the Subtropical Convergence, which distinguishes it from the neighboring oceans.
Step-by-step explanation:
The Southern Ocean surrounds the continent of Antarctica and is recognized by most geographers to have its northern boundary located at the 60° S latitude. This ocean is delineated from the Atlantic, Pacific, and Indian Oceans not by land, but by the marine conditions.
Specifically, it is characterized by the Subtropical Convergence, where the Antarctic Ocean's cold, dense waters meet the warmer waters from the north, promoting a rich ecosystem.
At the Antarctic Circle, located at 66.5° S latitude, you can observe the farthest point south that receives sunlight during the winter season.
In terms of physical geography, Antarctica is the southernmost continent, boasting the highest average elevation with prominent mountain ranges such as the Trans-Antarctic Mountains.
Politically, it is not controlled by any single nation but is managed by the international community under the Antarctic Treaty.
Please mention the correct option in the final answer: The Southern Ocean begins at the latitude of 60° S.