Correct answer choice is :
D) Speaking in public places to urge Americans to support the war.
Step-by-step explanation:
The Four Minute Men were a combination of missionaries empowered by United States President Woodrow Wilson, to give four-minute lectures on issues given to them by The Committee on Public Information. In 1917-1918, around 7,555,190 lectures were given in 5,200 societies. The points dispensed with the American war struggle in the First World War and were offered during the four minutes within spools editing in cinema houses across the nation. Also, the addresses were selected to be four minutes so that they could be given at city gatherings, restaurants, and other areas that had a public.