Concept:The busiest shipping routes are determined by high trade volume and major port connections.
Explanation:The Atlantic Ocean carries the highest volume of international sea traffic.
This is because it links major industrial regions, such as North America, Europe, and West Africa.
Key routes include the North Atlantic route between the USA/Canada and Europe.
These routes carry large amounts of manufactured goods, raw materials, and energy resources.
As a result, the Atlantic Ocean records more shipping activity than the Indian or Pacific Oceans.
Answer:Option C: Atlantic Ocean.