World War I Was an Important Factor in Advancing the Cause

World War I was an important factor in advancing the cause of women's suffrage because

A) the peace treaty that stopped the fighting required all countries to give women the right to vote.
B) a number of European nations threatened to refuse military assistance to the United States unless women were given the right to vote.
C) President Woodrow Wilson and members of Congress believed that women would support the war effort if they were granted the right to vote.
D) too many men were serving in the military overseas to have meaningful elections without the participation of women.