An 18-year old male presented with acute onset descending paralysis of 3 days duration. There is also a history of blurring of vision for the same duration. On examination, the patient has quadriparesis with areflexia. Both the pupils are non-reactive. The most probable diagnosis is:

• A. Poliomyelitis
• B. Botulism
• C. Diphtheria
• D. Porphyria