What is this passage mainly concerned with？A．The problems in U.S. hospitals and medical ce

What is this passage mainly concerned with？

A．The problems in U.S. hospitals and medical centers.

B．Why a hospital bill costs what it costs.

C．How difficult it is for a patient to get medical services.

D．How the medical charges rise as technology advances.

请帮忙给出正确答案和分析，谢谢！

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