Final answer:
Thomas Jefferson as president slowly undid everything the Federalists achieved by reversing their policies and dismantling or reducing major Federalist economic programs. Therefore, the correct option is C.
Step-by-step explanation:
Thomas Jefferson as president slowly undid everything the Federalists achieved. Over the course of his two terms, Jefferson reversed the policies of the Federalist Party by turning away from urban commercial development and promoting agriculture. He cut back on the military, ended internal taxes, and pursued a vision of limited federal government and fiscal austerity. While specific actions varied, Jefferson's overall approach aimed to dismantle or reduce the major Federalist economic programs. Therefore, the correct option is C.