The correct answer is 1, 3, 4.
1. They purchased war bonds.
3. They rationed food.
4. They employed women.
Due to patriotism rise, americans volunteered for military service despite that they did not have good numbers which were needed so as fight in the war.
The male who aged twenty one and thirty one were requested to register in the draft.
They also supported the war by conserving and growing of food.