The correct answer is:
It reaffirmed the Church's traditional beliefs.
The Council of Trent reaffirmed the traditional Catholic instructions in opposition to Protestant ideas. Both scripture and tradition were claimes as equivalent authorities in religious topics, and it was stated that only the church could interpret Scripture. While faith and good works were revealed fundamental for salvation, the hawking of indulgences was forbidden. However, the efficacy of indulgences, as well as the belief in purgatory, were reaffirmed.