How did people on the homefront help win the war

By purchasing war bonds.

Explanation: Many Americans supported the war effort by purchasing war bonds. Women replaced men in sports leagues, orchestras and community institutions. Americans grew 60% of the produce they consumed in “Victory Gardens." The war effort on the United States Home Front was a total effort.

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.

Explanation:

your answer would be (a)

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).