What initiative did Pope Paul III take during the Counter-Reformation?

Pope Paul III played a crucial role during the Counter-Reformation by establishing a commission to examine doctrines and practices of the Church. This initiative was part of a broader effort to address the challenges posed by the Protestant Reformation and to reform the Catholic Church from within. The commission was tasked with reviewing and clarifying Catholic teachings, as well as understanding the reasons behind the Protestant movement's criticisms. This action marked a significant step towards the Catholic Church's attempt to reaffirm its doctrines and restore its authority, ultimately leading to the Council of Trent, which furthered the Church's reformation efforts.

The other options do not align with Pope Paul III's initiatives; for instance, he did not abolish the Jesuit Order, which was established later by Ignatius of Loyola in 1534. Promoting the sale of indulgences had been one of the contentious points that led to the Reformation, and Pope Paul III worked to reform such practices rather than promote them. The construction of the Vatican walls, while significant, was not a direct initiative tied to the theological and doctrinal reforms of the Counter-Reformation.