Answer:
D. norepinephrine- botulism
Step-by-step explanation:
Botulism does not effect the neurotransmitter 'norepinephrine'. Rather, botulism occurs due to toxic consequences on the neurotransmitter 'acetylcholine'. Acetylcholine is produced by the motor neurons so that the muscles can operate properly. Botulism blocks the discharge of this neurotransmitter, acetylcholine, not the neurotransmitter, 'norepinephrine'.
Botulism occurs due to the production of a very harmful neurotoxin, Botulinum, which is made by the bacteria. The inhibition of acetylcholine which occurs due to this harmful toxin causes paralysis.