What was the original purpose of the constitutional convention?

Revise the Articles of Confederation, is the right answer.

Explanation:

The Constitutional Convention, held in the old Pennsylvania State House, in Philadelphia, was a Convention that took place in the period between 25th May to 17th  September 1787. The main purpose of conducting this convention was to revise the Articles of Confederation. The national government established under the Articles of Confederation was very weak and was inadequate to the social, strategic, and economic obstacles faced by the new nation.  A common agreement concluded that the Articles of Confederation were too weak to meet the need of the nation.