Why Is Japan's Unemployment Rate Consistently Well Below the Figures

Why is Japan's unemployment rate consistently well below the figures of most other high-income market economies,even during a recession?

A) The Japanese labor market is characterized by lifetime employment contracts,thus employees change jobs less frequently.
B) Because of a more dynamic business environment and higher labor mobility,employees are able to switch and obtain jobs more frequently.
C) The Japanese government regularly shifts resources to areas of high productivity by eliminating unprofitable enterprises.
D) Japan follows a highly expansionary monetary policy,which keeps the unemployment rate low.