What new class of people had been slowly gaining in influence and power since the decline of the roman catholic church, the feudal order, mercantilism and the rise of the private enterprise system?

for the !

D.) Could not settle disputes

Explanation:

The major downfall of the Articles of Confederation was simply weakness. The federal government, under the Articles, was too weak to enforce their laws and therefore had no power. The Continental Congress had borrowed money to fight the Revolutionary War and could not repay their debts.

(If I'm wrong, PLEASE let me know in the comments)