In amyotrophic lateral sclerosis (ALS), EMG characteristically demonstrates which combination of findings?
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A
Fibrillations, fasciculations, and large polyphasic motor unit action potentials
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B
Myopathic potentials with early recruitment and small MUAPs
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C
Absent sensory nerve action potentials with normal motor studies
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D
Conduction block at multiple sites with normal motor unit morphology