Suppose Someone Drawing a Conclusion from the Research on Expertise

Suppose someone drawing a conclusion from the research on expertise noted that many studies have found that people show more expert-like performance after considerable, deliberate practice in various domains such as chess, musical performance, mathematics, acting, and memory performance. The person then concludes that psychotherapists show more expert performance after years of practice, which is:

A) a faulty conclusion because some people are just naturally better therapists even without much experience.
B) a good conclusion that follows reasonably from all of the evidence in various domains.
C) a faulty conclusion based on a sweeping generalization and is not supported by research.
D) probably a good conclusion as long as the research supporting it in the other areas of expertise is of high quality.