Athens believed that every free-man should have a say in the government, so they made an assembly as the first step to create a democracy. I hope this helps to start you out.
They became rivals because each one wanted more power than the other for example in world war 2 the USA made the atomic bomb which showed the world that the Americans were the most powerful country but after ww2 Russia and USA started a Cold War which lead to the feud between there political views and the start of better technology and the space race
I think C, but I took that test last semester so I might be rusty. Lol.
