Elena presents with significant muscle atrophy in the lower extremities, fasciculations of the gastrocnemius, and a 1+ Achilles tendon reflex. During gait, the patient demonstrates a "slapping" foot strike. These signs are MOST indicative of:
A) A lesion in the corticospinal tract
B) An injury to the cerebellum
C) Compression of the posterior columns
D) A lesion in the anterior horn cells
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