Which describes an effect of US mobilization efforts during the war?

The military grew slowly once the United States entered the war.
Women were prohibited from serving in the military.
Very few people volunteered to help in the war effort.
More than 12 million people served during the war.

The answer is more than 12 million people served during the war.

Explanation: The statements that describes an effect of the United States of America mobilization efforts during the war is that more than 12 million people served during the war. During the war period Men between the ages of 18 and 45 were eligible to be drafted to go fight for the country.

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