Answer:
D - Nations in possession of huge stockpiles of lethal weapons are trying hard to avoid actual conflict.
Step-by-step explanation:
The answer is D because the author states, "...which have spent incalculable resources and energy for the production of deadly weapons are desperately trying to find out how they might never be used."
Even though the nations possess huge stockpiles of lethal weapons, they are trying hard to avoid actual conflict.