Final answer:
The Council of Trent reaffirmed most Catholic Doctrines during the Counter-Reformation.
Step-by-step explanation:
The doctrine that reaffirmed most Catholic Doctrines during the Counter-Reformation is a) Council of Trent. The Council of Trent was a church council that took place from 1545 to 1563. It affirmed many Catholic doctrines, including the Doctrine of Merit, the existence of Purgatory, the importance of sacraments, the necessity of religious art, and the authority of scripture and Church teachings and traditions.