42 A patient comes to the physician because in church he has begun falling every time he closes his eyes while standing for prayer. He has also noted progressive difficulty walking, he lifts each foot high and stamps it forcefully on the ground with each step. He must watch his feet while walking to avoid striking doors or other obstacles with them. The disorder producing these symptoms most likely involves which of the following structures? A) Cerebellum B) Joints C) Muscles D) Motor cortex E) Posterior columns

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