Answer:
Correct answer is B. They viewed it as a threat to their authority.
Step-by-step explanation:
Option A is not correct, as people were speaking Spanish anyway. Only members of clergy were speaking Latin.
B is correct as Catholic church was a strong ally of Crown. They were afraid that Protestantism will lower their authority, as it allowed more freedom.
C is not correct as Black Death happened in 14th Century.
D is not correct. This is actually the belief of certain Protestants, like Baptists.