Answer:
The answer is: C) The money spent on health care in the United States is not being used effectively.
Explanation:
American citizens spend twice as much as British citizens on health care per year. Even if certain diseases are more common in the US than in Britain, the overall cost of health care is too expensive in the US (100% difference) to be explained by a greater prevalence of just one or two diseases.
The only possible explanation is that the American health care system is not as efficient as the British health care system, therefore health care is more expensive.