Criticizing is a disapproving way to indicate the mistakes of others. The sentence shows the sarcastic tone used by the author. Thus, option A is correct.
A sarcastic tone is a verbal irony that sets the mood that the author is ridiculing the crowd that came to listen to him but were not appreciative and were sitting to criticize his idea and thoughts on the subject matter.
Sarcasm is a tone that depicts what the author is saying but means the opposite of what he wants the readers to understand. By using the word 'criticizing,' he mocks the people for attending the event.
Therefore, option A. the sarcasm best describes the tone of the sentence.
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