Final answer:
Juan Perón was excommunicated in 1955 for enacting an Argentine divorce law and expelling two priests. Eva Perón had died three years earlier, and neither Che Guevara nor Fidel Castro were involved with the matters of Argentine domestic policy.
Step-by-step explanation:
The individual who was excommunicated in 1955 for enacting an Argentine divorce law and expelling two priests was Juan Perón. Perón faced many challenges during his presidency, including a bitter fight with the Catholic Church that led to his ousting by the military in that same year. His wife, Eva Perón, had passed away in 1952 and could not have been involved in these events posthumously. Che Guevara and Fidel Castro were not associated with Argentina's internal religious or legislative matters as they were revolutionaries focused on Cuba's transformation and had no direct involvement with Argentine laws.
Following Eva Perón's death and before Juan Perón's exile to Spain, Argentina faced economic struggles and political instability. The conflict with the Church contributed to Perón's loss of support, eventually leading to his removal from office. After a period of exile, Juan Perón made a political comeback and was reelected as president in 1973 before his death in office in 1974.