The Great Depression was caused primarily by A. an economic downturn and the U. S. stock market crash.
B. the failure of nations to reduce their military forces.
C. a new interest in Marxist theory.
D. the strengthening of European banks.

increasing defense spending.

explanation:

where are the answer choices

nations must cooperate to bring about and maintain world peace.

nations must not wage wars or commit war crimes in a desire to control other nations.

i think i know which options you have but if these aren't options let me know