<span>- Produced agriculture where no one had thought possible.
- Played roles as traders and bandits on long distance trade routes.
- Played roles in the the collapses of the 2nd wave civilizations and their rebuilds.
- Supported Buddhism in China
- Nomadic Bedouin Arabs aided in expansion of Islam.
- Turks carried Islam to new lands.
- Mongols made largest empire of the time. - Facilitated closer connections across Eurasia.
- Increased the rate of technology & crop exchange, mixing of peoples, spread of epidemic disease.
- Mongol tolerance of other religions facilitated spread of religion.</span>
Basically, a citizen of the United States is any person who is in possession of the citizenship, which can be acquired by being born on the territory of the US or by being naturalized. The citizens, unlike other legal residents, can choose their representatives in elections.
I think that it is c but at the same time i think it is b