Which Category A agent is primarily associated with neuroparalysis?

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Neuroparalysis is caused by a toxin that stops nerves from signaling muscles. Botulinum toxin, produced by Clostridium botulinum, does exactly that by preventing the release of acetylcholine at the neuromuscular junction. The result is descending, symmetric, flaccid paralysis starting with cranial nerves (double vision, difficulty speaking and swallowing) and potentially progressing to limb weakness and respiratory failure. Among the listed Category A agents, this toxin is the one most characteristically linked to neuroparalysis, whereas the others produce systemic illness, pneumonia, or rash rather than primary nerve-to-muscle paralysis. So the correct association is botulism.