What Is a Key Reason Why Americans Might Travel Abroad

What is a key reason why Americans might travel abroad for health care:

A) because medical procedures are too costly
B) because the quality of health care for certain procedures is too low in the United States
C) because there are too few doctors in the United States
D) because the government is only willing to pay the full costs of medical care that is delivered in a country where treatment is less expensive
E) because the federal government is willing to cover healthcare costs regardless of where they are delivered