Answer:
The answer is either A or C, but most likely it is A
Explanation:
The main reason why Congress worked to keep a balance between the number of slaveholding states and free states is because they wanted to avoid war breaking out between the North and the South. They tried to do this through a series of compromises that ultimately failed.
The British troops marched to lexington and concord to get battle supplies and that is where the first event of the war happened. A famous gun shot was shot out, but nobody knows who did it. The events mark the start of the revolution becuase it was the first battle of the revolution.
Hope this helps!