Which of the following was a formal military formation created by Australia during World War II?

• A. Home Front Efforts: rationing, manufacturing weapons etc
• B. Formation of the Second Australian Imperial Force (AIF)
• C. Alliance with the United States
• D. Prime Minister Robert Menzies announced Australia's commitment to the war effort

Answer: (B)

The main idea here is understanding how Australia organized its military to fight overseas in World War II. The formation created specifically to serve abroad was the Second Australian Imperial Force. It was raised as an overseas fighting army, separate from domestic defence forces, and its creation was enabled by wartime changes that allowed volunteers to serve overseas. This made it a formal military formation with its own units and structure, ready to be deployed in places like North Africa, Greece, and later other theatres.

The other options describe civilian mobilization, an international alliance, or a political pledge, none of which constitute a formal military formation.