The correct answer is A) approve the sale of indulgences.
The Council of Trent did all the following except "approve the sale of indulgences."
What the Council of Trent did was to reaffirm the authority of the Pope,
established seminaries for the training of priests, and backed the traditional interpretation of transubstantiation. The Council was held from 1545 to 1563 in the city of Trento, Italy. It was the Catholic Church's reaction to the Protestant Reformation led by Martin Luther, a German monk, that had written the influential book "95 Theses," in which he questioned and critiqued the selling of indulgences by the Catholic Church.
