What was the estimated number of uninsured individuals eligible for Medicaid under the ACA in the U.S. as of April 2014?

The estimated number of uninsured individuals eligible for Medicaid under the Affordable Care Act (ACA) in the U.S. as of April 2014 was approximately 8,748,000 adults and 5,220,000 children. This estimate reflects the expansion of Medicaid that was one of the key components of the ACA, aimed at increasing health coverage for low-income individuals and families.

The figures showcase the significant potential for Medicaid expansion to reduce the number of uninsured, particularly among vulnerable populations like children and low-income adults. The numbers derived from research and data collections at the time indicated a pressing need to cover these populations as part of the ACA's goal to increase health insurance accessibility and affordability.

Other options presented may have misrepresented the data available, reflecting different estimates that do not align with the established research and analyses conducted by various organizations around the implementation of the ACA during that period. The context of the time indicates that understanding these numbers was crucial for assessing the impact of the ACA on different demographics within the uninsured population.