Answer:
Countries built large armies and stockpiled powerful weapons.
Explanation:
In an effort to hold onto their territorial as well as world colonies and might, many European nations expanded their military industries and armies, as well as expanded colonial rule and spheres of influence wherever they could. This led to countries drawing recruits and forcing colonies to produce war material for the host nation during World War I.
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The most important factor from the options that lead to radicalized political parties was The Great Depression of 1929 (C).
The Wall Street Crash of 1929 led to a chain reaction not only in the U.S. but in many European countries as well. In the worst moments of the period, 22 to 23% of the American workforce, and 44% of German's workforce didn't have a job.
Due to the crisis, many American creditors charged loans made throughout the world; American companies stopped investing in other countries.
This generalized crisis, unemployment, and increasing misery of the population created a fertile soil on which fascist and nazi political figures fed.
