Final answer:
Psychotherapy shows positive outcomes, with the average psychotherapy client doing better than 80% of untreated individuals, indicating the efficacy of psychotherapy treatments.
Step-by-step explanation:
In comparing the outcomes of psychotherapy clients with untreated individuals, the respective research suggests that the average psychotherapy client fares better than many untreated individuals. Specifically speaking to the question, the correct answer would be: a. better than the outcomes for 80% of the untreated people. This conclusion is based on studies such as those by Wampold (2007) which reflect the positive impacts of psychotherapy on clients' circumstances compared to those who did not receive treatment. While clients may still experience certain health challenges compared to the general public, psychotherapy does contribute significantly to their overall well-being.