Concept:The busiest canal is judged by the volume of international shipping and cargo it handles each year.Explanation:The Suez Canal links the Mediterranean Sea with the Red Sea. It provides a shorter route for ships moving between Europe and Asia. This canal carries a very high volume of world trade, which makes it the busiest canal in the world.The Panama Canal is an important route for ships moving between the Atlantic and Pacific Oceans, especially between the east and west coasts of the United States. However, it does not handle as much international traffic as the Suez Canal.Therefore, the busiest canal in the world is the Suez Canal.Answer:A. Suez Canal