What was the main reason why the great depression was felt so financially in europe, even before the actual stock market crash of 1929?

a) the financial cost of building up the military to defeat hitler.
b) too many nations were spending and investing money in the united states.
c) the financial cost of world war i left many nations with no money and high unemployment.
d) too many industries moved to the united states after world war i and never returned to europe.