What did Roosevelt's response to the London Conference signal about the role of the United States in global affairs?

AWillkie was an isolationist, while Roosevelt believed it was time for the Unites States to join the war.
BWillkie believed the United States should take steps toward joining the war.
CWillkie believed the government should limit its expenditures.
DRoosevelt was in favor of supporting Britain in its defense against Hitler, while Willkie was not.