Final answer:
Having a low prisoner number suggests a greater knowledge of escape routes out of the Lager.
Step-by-step explanation:
The question is asking what having a low prisoner number suggests. Based on the given options, having a low prisoner number suggests a greater knowledge of escape routes out of the Lager. In other words, prisoners with low numbers may have been incarcerated for a longer period of time and have had more opportunities to learn about and plan for escape.