The correct answer is A, 'catharsis'. Because that means 'purification' or 'cleansing' from those negative urges and behaviors. 'Antistrophe' is a song sung by the chorus, and the rest of the options are obviously not correct.
In school it sometimes gets boring to listen to the teacher all the time, and work with the same person over an over againe. Group work is the best solution for this.