Given the Availability of the Medicaid Program, Why Are So

Given the availability of the Medicaid program, why are so many poor people uninsured?

A) Because only a fixed percentage of the population can participate in Medicaid at any time.
B) Because many poor people earn enough that they do not qualify for Medicaid.
C) Because non-income requirements screen many poor people from the program.
D) Because only native-born Americans are eligible for the program.