The correct answer to this open question is the following.
Some delegates opposed to allowing Congress to select the President because they did not want to have a strong central government that could turn into a tyranny due to the lack of constitutional civil rights.
During the Constitutional Convention in Philadelphia, Pennsylvania, the delegates debated from May to September 1787 to decide the kind of government for the new nation. Federalists such as John Jay and Alexander Hamilton favored a strong central gogernment, meanwhile, antifederalists such as Thomas Jefferson were against that idea and supported more liberties and rights for the people.