More than 6,00,000 citizens had lost their lives in the war. Thus, option C is correct.
The American Civil War was a conflict between the Union and the Confederacy that took place in the United States because the confederacy was not happy with the injustice that was happening to them.
The main reason for the civil war was that slavery was still in practice and people wanted it to come to an end and all the people should be treated as equals and the power that was there with the US should be present in a more diverse form.
This war cost the lives of more than 600000 people in a total of both the Union and the Confederacy where the lives lost by the union were more than that of confederacy for it to end slavery. Therefore, option C is the correct option.
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The question is incomplete, the complete question will be:
More than _____ citizens had lost their lives in the civil war
