I believe it is D. Characteristics of productivity
Athenian democracy developed around the sixth century BC in the Greek city-state (known as a polis) of Athens, comprising the city of Athens and the surrounding territory of Attica. Athenian democracy is often described as the first known democracy in the world. Hope this helps
Answer: C. They have acted as an obstacle between the eastern and western sections of the state.
Explanation: I did the k12 test so that's how I know! :) ;)
B. Play soft music in the background while studying.