Japan Provides a Uniquely Extreme Example of Which of the Following

Japan provides a uniquely extreme example of which of the following issues in the transition of developed democracies?

A) a focus on individual freedom that has resulted in much reduced collective equality
B) rapidly increasing immigration that has reduced public support for welfare benefits
C) regional integration that has reduced national sovereignty
D) population aging and homogeneity that threatens the welfare state
E) devolution that has reduced national sovereignty