Helps maintain strength and flexibility
So B is definitely not correct. A is not super important. Gotta wither be C or D but it is probably C because that is why they did revisions to the AoC because they needed a new system.
Answer: C
Civil War Amendments--The 13th, 14th, and 15th Amendments were passed during Reconstruction changing the lives of blacks and whites in the South.
The 13th Amendment ended slavery allowing blacks to work freely but also leaving plantations without workers. The 14th Amendment gave blacks citizenship and the 15th Amendment gave black men the right to vote.