Read this paragraph from the text.
Powerful drugs or a heart transplant can help many people who suffer from heart failure. But the drugs don't always work, and heart transplants are risky. For years, doctors have inserted a mechanical pump in the bodies of some patients who were waiting for a heart transplant. The pump helped the heart do its job. The study by Dr. Rose shows that the pump could be used permanently, instead of a heart transplant.
What can you conclude about treatment methods based on this evidence?
A.Heart pumps and heart transplants are the safest options for treatment.
B.Most people with heart failure wait for 10 years for a heart transplant.
C.Heart pumps may be safer or more effective than other treatment options.
D.Heart transplants and drugs are both very safe treatment options.