Individuals experiencing a stroke on a cruise ship face significant challenges due to the time required to reach medical facilities. Last year, Oceanic Cruises implemented training for its staff on the use of onboard medical equipment to assist stroke victims. Since then, the recovery rate for passengers who suffer strokes on Oceanic Cruises has improved. However, this training may not be the reason for the improvement, because -------------.

Which of the following most logically completes the passage?