The answer would be C, Small Words!
Answer:
Impudence's meaning is not showing due respect for another person; impertinent, insolent. I highly doubt that a person who is impudent with others could ever cool off a tense situation. They would have to change their attitude towards others to be able to calm down.
For example, "the student is being impudent with his teacher".
So, it’s the only one of these that makes sense :)