How did the Affordable Care Act affect health insurance coverage among the working poor?

	a.	It expanded Medicaid coverage for low-income workers, but numerous states opted out of this expansion and therefore there are still millions who lack insurance.
	b.	It raised the cost of insurance by forcing the working poor to demonstrate that they have had continuous health insurance coverage for the past twelve months.
	c.	It offered substantial subsidies to the working poor to purchase health insurance, and because of broad adoption there are very few in America who now lack insurance.
	d.	It had no effect on the percentage of the population who have health insurance coverage.