When the United States Is Described as Having a Dual

When the United States is described as having a dual system of health care, this means that

A) government provides basic health insurance for all Americans and private insurance covers services beyond the basic level.
B) high-quality care is provided in urban areas, but care in rural areas is of poor quality.
C) those Americans with good insurance or substantial wealth receive world-class health care, while those without insurance receive no or low-quality health care.
D) the high-risk segment of the population is required to have health insurance, while the low-risk sector is not.