C, “With malice toward non; with charity for all”.
According to Albert Barnes, their mistake was that they didn't speak against slavery. Although many of them believed that slavery was against god and against the idea that god made everyone equal, they didn't do much against it out of many reasons, either they thought it was a necessary evil or they were afraid of the public reaction.
Answer:
The pope had the authority to excommunicate anyone
Explanation:
Europeans viewed the spread of Islam as a threat and actively worked to stop it.
