The American attitude shifted in favor of rights for Native Americans. This is based on "Polls showed that Americans believed in rights for Native Americans". Why it's not B is because it wasn't the polling that contributed to the act, but what the polls showed which is C.
The correct answer is - Kublai Khan promoted religious tolerance and exchanges between Christians, Muslims, Buddhists, and Hindus.
Kublai Khan, and pretty much all the rulers of the Mongol Empire, even though mostly are portrayed as savages and barbarians, were actually one of the most tolerant of all in there time towards the different cultures and religions, and never made problems to the people they were ruling over on this basis. The Mongols can even be seen like globalists, and they encouraged cultural exchange, religious exchange and tolerance, and were trying to create an environment were people from different ethnicity, cultural and religious backgrounds would live in peace and harmony, and through it to create a unified empire.
I believe there was a contest but I am not sure the answer to your first question.
D.)increased migration of people for economic opportunity
One of the main ways they were similar was in their form of government. Both Athens and Sparta had an assembly, whose members were elected by the people. Thus, because both parts of Athens' government had leaders who were elected, Athens is said to have been the birthplace of democracy. Spartan life was simple.
Sure hope this helps you