The correct answer is: "In the meantime, women - including many African American women - assisted the war effort at home by working in factories and offices."
This piece of evidence is the only one that addresses all the topics mentioned in the claim. It refers the women's role during WWII, highlighting the African American citizens. By using the word "meantime" it makes clear that this took place during the war and was directly related to it. It also makes clear that their effort was at home (in the U.S.) as they could not enlist, the statement mentions "democracy was far from complete at home".
Lastly it shows how women participated in the efforts of war by working in factories and offices, this is the "significant role" mentioned in the statement.
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