According to the text, what is the primary reason that Medicare is severely challenged financially?

Question

Quizplus · Accepted Answer

Although health-care costs per person are increasing, the average life expectancy is increasing, and there are more people living past the age of 90, and these factors do contribute to the costs paid by Medicare, the PRIMARY reason for the financial challenge that Medicare is facing is that the sheer number of older adults covered by this plan is increasing so dramatically.

According to the Text, What Is the Primary Reason That