Final answer:
Guided imagery has been proven helpful for a range of conditions such as headaches, asthma, hypertension, diabetes, arthritis, insomnia, depression, anxiety, and PTSD. It is most effective when individuals are responsive to suggestion via hypnosis, meditation, and cognitive therapy.
Step-by-step explanation:
Guided imagery, a practice that involves creating soothing and positive mental images to promote relaxation and healing, has been found to be helpful for a variety of health conditions. The correct answer to the question is d) All of the above. This technique has been successfully used to alleviate symptoms associated with conditions like headaches, asthma, and hypertension, among others. Additionally, it can be beneficial for individuals with diabetes, arthritis, and insomnia, as well as for mental health disorders like depression, anxiety, and post-traumatic stress disorder (PTSD). Guided imagery is most effective in individuals that are very open to the power of suggestion through techniques such as hypnosis, meditation, and cognitive therapy, which can influence cognitive processes and potentially lead to treatments for disorders where recollection creates a disability.