C is the correct answer because the Aborigines were not immune to European diseases
Its d. Alexander Hamilton <span />
The Founders made the amendment process difficult because they wanted to lock in the political deals that made ratification of the Constitution possible. Moreover, they recognized that, for a government to function well, the ground rules should be stable.
No one knows for sure when it first started, but it was becoming more and more common throughout the Han Dynasty.
Hope this helps.