Final answer:
The regulation not identified by TR Reid as being part of well-functioning health systems in other developed countries is 'c) No-profit motive for insurers'. Other regulations such as universal access, community rating, and guaranteed issue are typically present.
Step-by-step explanation:
The option which is NOT one of the three regulations identified by TR Reid for a generally well-functioning market-based health system is 'c) No-profit motive for insurers'.
Developed countries with successful healthcare systems commonly have regulations including Universal access to healthcare services, Community rating, where insurers must offer policies within a given region at the same price to all persons without medical underwriting, and Guaranteed issue of insurance, which prohibits insurers from denying coverage to individuals due to pre-existing conditions.
However, not all these systems remove the profit motive for insurers; some mix public and private aspects, allowing for-profit insurers to operate under strict regulations.
Hence, the answer is option c.