The Council of Trent, held over a span of years from 1545 to 1563, served to reform some abuses that were acknowledged by the Catholic Church. Mostly, though, the Council aimed to assert the full authority of Roman power and doctrine over the Protestant threat.
Simony was the practice of buying and selling church offices. The Council of Trent condemned such practices, which had been widely abused in the church and criticized by reformers.
As for indulgences, the underlying principle of indulgences was upheld -- that the church had authority to grant reprieve to penance or time in purgatory. But the sale of indulgences was stopped. The church recognized that the selling of indulgences had been an abuse and determined to end that practice.
As for clergy education, seminaries were established and the Roman Catechism, also known as the Catechism of the Council of Trent, was commissioned by the Council and was published in 1566,. The intention of these actions was thoroughly to improve the education of the church's clergy.
The answer is B purely due to this statement: "secures the blessings of liberty" which is in the preamble. Also because it is defined as a natural right. Hope this helps and let me know if you need more help!
