Which of the following is NOT a problem faced by Japan?

The correct choice suggests that all the listed options (A, B, and C) represent challenges that Japan is facing. Japan encounters significant demographic issues, particularly with its aging population. The younger population does not have the capacity to support the growing number of elderly citizens, creating a strain on social welfare systems and healthcare services.

Slow economic growth is another pressing issue for Japan. It has faced stagnant economic performance for years, marked by deflationary pressures and demographic challenges that hinder substantial growth.

Furthermore, Japan does have one of the highest levels of public debt globally, which complicates fiscal policy and government spending on necessary services.

Therefore, the assertion that there are no problems mentioned — indicated by selecting "none of the above" — emphasizes that all options accurately reflect real challenges faced by Japan. Hence, recognizing that all the statements are valid confirms the understanding of Japan's complex socio-economic landscape.