On the average, patients receiving psychotherapy improve more than about __________ of similar people on a waiting list to receive treatment.

A) 0%
B) 50%
C) 80%
D) 100%

On average, patients receiving psychotherapy improve more than about 80% of similar people on a waiting list to receive treatment. This is known as the "80% rule of psychotherapy," which suggests that psychotherapy is effective for the majority of individuals who seek it out. However, it is important to note that there is variability in individual outcomes and some people may not experience significant improvement.