[Economist Article] The article discussed US healthcare administration costs and gave the example that Duke University Hospital had "400 more billing clerks (1,300) than hospital beds (900)." Which concept from the course does this statement represent?

Group of answer choices

A. The portion of a utility curve beyond the peak where utility starts to decline as the quantity consumed increases

B. An increase in the average total cost (ATC) of treating patients

C. An example of market failure for the production of healthcare

D. A decrease in the marginal revenue from patient admissions