Final answer:
The Council of Trent met for 25 lengthy sessions to address Protestant reforms by reaffirming Church doctrines and making reforms.
Step-by-step explanation:
Meeting for 25 lengthy sessions, the Council of Trent decided that Protestant attacks could be met by reaffirming Church doctrines and conducting reforms. The Council of Trent, which initially convened in 1545, aimed to address the issues posed by the Protestant Reformation initiated by Martin Luther. The council produced key outcomes, including the affirmation of the Doctrine of Merit, seven sacraments, religious art, and the authority of both scripture and church tradition. The responses to these Protestant criticisms aimed to solidify the Catholic Church's stance and curb the spread of Protestantism.