Please help! Social Studies

Buying war bonds to supply money to the gov't. I think

Explanation:

Providing supplies to American and Allied troops fighting the war in Europe, Africa, and the Pacific required the efforts of all Americans. At home, citizens contributed to the war effort by rationing consumer goods, recycling materials, purchasing war bonds, and working in war industries.

answer; ///attempts to change more than once behavior at the same time;

answer; control group;