Final answer:
Shays' Rebellion demonstrated the ineffectiveness of the Articles of Confederation, leading to the creation of the U.S. Constitution for a stronger centralized government. The correct option is d.
Step-by-step explanation:
The event that showed that the Articles of Confederation were ineffective was d. Shays' Rebellion. Shays' Rebellion was an uprising of Massachusetts farmers led by Daniel Shays which highlighted the weaknesses of the Articles of Confederation.
With the government under the Articles lacking the power to raise an army or assist in quelling the rebellion, it became evident that a stronger central government was necessary.
This realization spurred on the creation of a new Constitution, as the incident underscored the inability of the Articles to maintain order or address the economic problems facing the post-Revolutionary United States. Option d. is the correct one.