The orginal purpose of the 1787 convention in Philadelphia was to:

http://en.wikipedia.org/wiki/Philadelphia_Convention

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To determine the original purpose of the 1787 convention in Philadelphia, we can examine historical sources or reference materials such as textbooks, articles, or reputable websites.

One reliable source is James Madison's notes on the Constitutional Convention. According to Madison's notes, the convention was initially called to revise the Articles of Confederation, the first governing document of the United States. However, during the course of the convention, it became clear that merely revising the Articles would not be sufficient, and the delegates decided to draft an entirely new constitution instead. Therefore, the correct answer is:

c. draft a new constitution.