Why does this patient have difficulty walking?

A 24 year-old female presents with a history of multiple ankle sprains and complains of difficulty keeping up with her peers on group walks. An X-Ray of her foot demonstrates pes cavus and hammer toes. What diagnosis is suggested?

A. Friedrich’s ataxia
B. Plantar fasciitis
C. Charcot-Marie-Tooth disease
D. Rheumatoid arthritis

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