Why did delegates from the states gather at a convention in Philadelphia in May of 1787?

to end the slave trade
to stop to Shays's Rebellion
to limit the power of the national government
to revise the Articles of Confederation

Why is James Madison remembered as the Father of the Constitution?

He was the primary author of the New Jersey Plan.
He acted as president of the convention.
He played a key role in planning the convention and writing the Constitution.
He proposed the Great Compromise.