The first alternative is correct (A)
The Council of Trent, was the 13th Council of the Catholic Church that took place between 1546 and 1563, characterized as a movement of institutional and dogmatic reorganization of the Catholic Church in the sixteenth century.
The Council of Trent was also a reaction to the Church's criticisms of the Protestant Reformation led by Martin Luther, and was considered the main frame of the Counter-Reformation. The Council of Trent was convened to reaffirm Catholic dogmas and readjust the conduct of Catholic clergy and laity, including in cases of corruption.