Answer: C. The act stated that the land could not be taken away for any reason.
The correct answer is Timbuktu. It became the greatest city because it was a melting pot for traders from all possible nations because it was wealthy and developed compared to other places. It was a cultural and a trading center because the ruler knew how to rule properly and made Timbuktu one of the greatest cities in the world.
By not being a social activist. Forcibly pushing an agenda to "change" the views of the people always results in discrimination, hate, and violence. The best way to achieve social change is on a personal level. Forget what is going on the world around you because you cannot change the views of the people around you, you can only change your own views. If you act as an tolerable individual, as a good person, and as a person who believes in treating people as human beings, you will create more of a positive effect than these so called "peaceful" protestors who think it is okay to shut down businesses, institutions, and parades in order to make a point.
Out of all those awnsers 6000 BCE is right.