What caused the relatively lower unemployment rates in some Western European countries dur

What caused the relatively lower unemployment rates in some Western European countries during the worldwide recession？

A．The safety nets allowing people to keep their jobs more easily in economic slowdown.

B．The employment system that enable people to get jobs more easily.

C．The programs that allow people to avoid being laid off during economic recession.

D．The economic system that is less vulnerable to economic crisis.

请帮忙给出正确答案和分析，谢谢！