Hello. Unfortunately, you did not enter the article this question refers to, which makes it impossible for you to answer it. However, I will try to help you as best I can.
To answer this question, you need to read the entire article. After reading this, you should assess what factors, elements, events, or situations the article presents that could have a major impact on Norman Bowker's PTSD. This impact has to be able to bring about large and positive results that cause differences in PTSD.