The Protestants opposed the sale of indulgences, while the Catholics were in favor of the same.
Catholics do not believe in the pope's authority, or constitutional monarchy. Furthermore, the protestants are completely in contrast to the Catholics.
In the same way, Catholics were completely in favor of the sale of indulgences, while the protestants did not allow the same.
Hence, option B states the point of difference between the Catholics and the Protestants.
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