Congress Instituted the "Look Back" Period of Five Years in Medicaid

Congress instituted the "look back" period of five years in Medicaid because:

A) it wanted to encourage people from the upper class to use Medicaid.
B) it wanted to ensure that the poor get adequate treatment for additional five years.
C) it believed that the funds for Medicaid were unevenly distributed among the various classes in the United States.
D) it suspected that middle-class elderly were sheltering their assets in order to qualify for Medicaid.