Another word for the Enlightenment era is sometimes called The Age of Reason. <span />
Answer:
provide workers for industrial nations
First thing that comes to mind is Russia had a strategic advantage to the Nazis. The Russian military knew the terrain (I believe it was mountainous) and the cold climate helped push back the Nazis. The Nazis actually tried to get into Russia. That was the only country I could think of.
Most countries, I think did not have the military power to stop Hitler/Nazis from invading them.
Hopefully this helps.
Answer:
a. obligations based
is correct option according to your questions