Scenario II It Is Challenging to Conclusively Demonstrate the Effectiveness of Treatments

Scenario II
It is challenging to conclusively demonstrate the effectiveness of treatments for psychological disorders. Although treatments may appear to work, their apparent effectiveness could be due to a number of other factors, termed treatment illusions. Treatments may appear effective due to natural improvement unrelated to the treatment, placebo effects in which the apparent effectiveness of a treatment is due to the expectancy of its effectiveness, and reconstructive memory in which persons remember their symptoms prior to treatment as more severe than they were.
-(Scenario II) Treatment for which of these psychological disorders is most susceptible to the treatment illusion of natural improvement?

A) major depressive disorder
B) schizophrenia
C) obsessive-compulsive disorder
D) autism spectrum disorder