What was the main purpose of this World War II poster?

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Explanation:

To preserve resources for the war effort, posters championed carpooling to save on gas, warned against wasting food and urged people to collect scrap metal to recycle into military materials.

Posters were produced asking Americans to try and conserve products such as fats, butter, coffee, and rubber. Conservation was the largest theme among posters produced during the war, as one in seven posters carried this theme. Their efforts were not a waste, as the United States was successful in recycling goods.

d. it gave farmers a way to organize for more political power