Answer:
B
Step-by-step explanation:
A rebuttal serves the purpose of contradicting an idea or concept by way of showing evidence that refutes a previous idea. Such is the case of presenting the fact that humor can be beneficial in order for people to be able to cope with serious topics; this argument is in opposition with the idea that sarcasm can be considered inappropriate. The supporting argument renders credibility for it is based on facts. Evidence is what makes a rebuttal effective.