It was violence that occured after the French Revolution and run by The Girondins and The Mountain, and marked as the 'enemies of the revolution'
Equal representation is the idea that all people should have equal representation in the power structures, and that noone's votes should have more strength than the rest. (this is not the case in the US, where the votes from people from different states have different strength of influence.
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In the 1920s, the danger of buying stock on credit was that if the stock dropped, borrowers have to make up the difference.
When the stock dropped, basically the borrowers losing an amount of value of his assets. But since he bought the stock before the price was dropped, he had to make up the difference
The second amendment gives people the right to own guns. The third amendment basically states that you can’t force people to house soldiers (more relevant in the older times). So, obviously the amendment we are dealing with here is the second amendment. A city or state is not allowed to ban something that is protected by the amendments, and having and owning a hand gun is protected by the second amendment (with a license). Therefore, the city of Chicago violated the second amendment. Your answer would be A.
Hope this helps :)