Which of the following is the reason for the increasing private health care? ( )

参考解析：

是非题。根据题干关键词private health care定位至文中末段The idea is that the rich pay more towards the health service than the poor. However, in recent years there has been a great increase in the use of private health care…The NHS waiting lists for operations can be very long, so many people who can afford it choose to pay for medical care themselves.可知，私营医疗保健日渐盛行的原因在于国家医疗保健中心的服务供过于求，选项D的表述正确。选项AB的表述过于肯定,选项C的表述错误,不是对于大多数人而言国家医保中心不可用,而是供过于求导致了许多不便利。故正确答案是选项D。