Which of the following best explains "ended up" as is used in the passage（）

A．to help patients recover
B．to increase the number of heart surgeries
C．to get back the money spent on the equipment
D．to buy new equipment for the treatment of heart disease

A．It has reduced the costs of medical treatment.
B．It has helped save the lives of most patients.
C．It has encouraged doctors to do more heart surgeries.
D．It have helped educate people about the prevention of heart disease.