The correct answer is B: the king reformed the encomienda system and the Dominicans changed how they spread Christianity in Central America.
Over time, there were reforms aimed at improving the treatment of indigenous people, including the New Laws of 1542, which sought to protect them from exploitation under the encomienda system. Additionally, religious orders, such as the Dominicans, advocated for better treatment of indigenous peoples and a more respectful approach to their conversion to Christianity.