Final answer:
Cognitive therapy has been successfully used to treat depression, anxiety disorders, and eating disorders, but it is not the sole method of treatment for schizophrenia, which typically requires a combination of therapies including medication. Therefore, the correct answer is:c) Schizophrenia
Step-by-step explanation:
The question asks which of the following has NOT been successfully treated with cognitive therapy: a) Depression, b) Anxiety disorders, c) Schizophrenia, d) Eating disorders. Among these, cognitive therapy has been proven as an effective treatment for depression, anxiety disorders, and eating disorders. However, when it comes to treating schizophrenia, cognitive therapy is not typically the sole method of treatment. While cognitive therapy can be a part of the treatment plan for schizophrenia, it is usually combined with other treatments such as antipsychotic medications and other psychosocial interventions. Cognitive therapy has been found to be effective in treating depression, anxiety disorders, and eating disorders. However, it is generally not considered the primary treatment for schizophrenia. Schizophrenia is a severe mental disorder that often requires a combination of medications, psychotherapy, and other support services.