Final answer:
The correct answer is D. Helms-Burton Act, which permits Americans to sue foreign companies using property nationalized in Cuba after the 1959 revolution.
Step-by-step explanation:
The act that allows Americans to sue foreign firms that use property in Cuba confiscated from them after the 1959 revolution is known as the Helms-Burton Act. Passed in 1996, it strengthens and continues the United States' economic sanctions against the Cuban government, specifically targeting properties that were nationalized by Cuba after the revolution which saw Fidel Castro come to power. This legislation was part of a wider approach related to the United States' historical involvement in Cuba, following earlier policies such as the Platt Amendment, which heavily influenced Cuba's sovereignty, and the economic embargo instituted in response to Castro's nationalization of American-owned properties.