Can you help me understand this Psychology question?

Imagine that some of your colleagues mention using cognitive behavior therapy, dialectical behavioral therapy, acceptance and commitment therapy, and reality therapy. Your colleagues continue to say that based on their experiences, they really like these therapies and that they appear to work. Your instinctsalso tell you that perhaps they might be helpful for your client in your case study. However, from Week 1, you recall that experiences and instincts as sources of knowledge are quite limited because they are biased. Instead, it is important to utilize existing research and data to support your choices of interventions.