Increased is the correct answer
The correct answer to this open question is the following.
Although there are no options attached we can say the following.
The civil war tested the foundation of a country that uses democracy in that the civil war confronts people from the same country on the battlefield for political and economic reasons.
It is hard to believe that people from the same nationality -brothers we could say in a metaphorical way- confront each other to the extreme of seceding from the Union and fight using weapons. A civil war is an internal battle that hurts democracy and the legitimacy of the government that the founding fathers so carefully planned for the United States since colonial American times.
A civil war separates, divides. As President Abraham Lincoln said in his famous speech "A House divided," if a country is divided from within, this not only hurts democracy and freedom but also impacts all aspects and foundations of a nation.
The answer to that would be either A or C
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