The answer is C because it is used in negative connotation and the other ones are in a positive connotation. The word imperious is in a negative connatation as it means someone demanding for power. They described the librarian as a scary person almost, thus making the answer C.
To maintain their credibility,the writers had to give specific examples---evidence--- of how they had been mistreated.
from brainly.com/question/1099089
