religious differences and the promise of wealth
Answer:
I'm pretty sure the answer is tenant farmers could use a skill they already had rather than starting over.
Answer:
The Silk Road and the Great Wall of China represent different approaches and goals of the Chinese foreign policy.
The Silk Road is expansionary foreign policy: its goal is to increase communications and trade with other countries, from the Mediterranean, to Iran, to Tibet.
The Great of Wall of China has the opposite goal: to keep foreign invaders from entering the Chinese hinterland.
It would be that "d. They refused to baptize native converts into the Christian faith", since the Spanish viewed this as a way of solidifying their efforts of religious conversion.