Answer:
B- Council of Trent.
Explanation:
This was an ecumenic council called by the Roman Catholic Church to adopt internal reforms to face the challenges posed by the Reformation of Martin Luther. It started in 1545 and ended in 1563. It was celebrated in the Italian northern city of Italy of Trent. Pope Paul III made the initial call. In the end, the gaps between Protestants and Catholics were not filled and divisions persisted and deepened.