Answer:
C. Without mitigation, the conference deteriorated into a full-fledged hullabaloo.
Explanation:
The answer is "C" because in the sentence "Without mitigation, the conference deteriorated into a full-fledged hullabaloo" there is a use of formal words such as mitigation, deteriorated, full-fledged hullabaloo. We can say the same with other words using an informal language:
"The conference was a complete disaster."
You can use informal language when you are talking to your family or friends but you can't use informal language when you are writing an essay.
