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 nonincome requirements screen many poor people from the program.
D) Because only native-born Americans are eligible for the program.