The depletion of the world's fisheries is most likely due to which of the following?

A) sport fishing
B) commercial large-scale fishing
C) discharge of sewage and garbage from cruise ships
D) natural climate shifts
E) natural extinction of fish population

Commercial large-scale fishing is the most likely cause of depletion of the world's fisheries as it involves catching large quantities of fish for human consumption, often using unsustainable methods such as trawling or overfishing particular species. Sport fishing, discharge of sewage and garbage from cruise ships, and natural climate shifts can also have an impact on fisheries, but they are not the primary cause of depletion. Natural extinction of fish populations occurs over a long period of time and is not the main reason for the depletion of fisheries in recent years.