What fraction of people will experience PTSD?

The fraction of people who will experience PTSD is accurately represented by the choice indicating that 7 or 8 out of every 100 individuals may be affected. This statistic aligns with research that suggests approximately 7-8% of the general population will experience PTSD at some point in their lives, particularly following exposure to traumatic events. Hence, this response provides a clearer understanding of the prevalence of PTSD and reflects a more precise estimate based on epidemiological studies.

Other choices either overestimate or underestimate the prevalence of PTSD in the general population. Thus, the choice providing the 7 or 8 out of every 100 statistic is supported by reliable data, making it the correct answer in the context of understanding how common PTSD is.