The danger of populism is that populist governments claim to do everything in the interests of the majority but they see the rights of the citizens as an obstacle for their goals, based in their beliefs. Some of these dangers might arise as racism and intolerance against immigrants.
The answer is C. The articles of confederation promoted a more lose united states giving the states more power then the federal government. While the constitution promoted a more federal and centeral united states while still maintaining state rights.