The best option that describes how U.S. foreign policy today differs from that during the country's founding is:
C) The country's foreign policy has shifted from an isolationism perspective to an internationalism perspective.
During its founding, the United States largely adhered to isolationist principles, particularly articulated in George Washington's Farewell Address, which cautioned against entangling alliances. Over time, especially following World War II, U.S. foreign policy evolved towards internationalism, actively engaging in global affairs, forming international institutions, and participating in numerous alliances and treaties.