What was the main function of George Creel’s “four-minute men”?

What was the main function of George Creel’s “four-minute men”?

A: They could be prepared for military action within four minutes.
B: They delivered short, patriotic speeches to gain support for the war.
C: They brainstormed voluntary acts to conserve fuel for war efforts.
D: They decided on loan allocations for Great Britain and France.
E: They handled the labor and time management for war industries.