Part A: What does the phrase “Pure Concentration-Camp Style” suggest about the wall in paragraph 16?

This phrase suggests a barbed wire fence.

Without needing to speak, both came out with the conclusion that only one was worth considering. It was the ugliest but the most honest in its suggestion of the pure concentration-camp style, no frills, all evident efficacy. Placed the length of walls, it consisted of a continuous coil of stiff and shining metal serrated into jagged blades, so that there would be no way of climbing over it and no way through its tunnel without getting entangled in its fangs. There would be no way out, only a struggle getting bloodier and bloodier, a deeper and sharper hooking and tearing of flesh.