The correct answer is C) The two churches split apart permanently.
The effect that the dispute between the Orthodox and the Roman Catholic churches had n the 11th century was that the two churches split apart permanently.
We are talking about the Great Schism, of 1054, that split the church. Yes, on July 16. 1054, Michale Cerilarius, Patriarch of Constantinople, was excommunicated by the Church. This represented the Great Schism that divided the church in two the Eastern Orthodox church and the Roman Catholic church.