A 50-year-old woman presents after a bicycle accident complaining of right midfoot tenderness. You are concerned about an injury to the Lisfranc's joint. Which of the following is TRUE regarding this injury?
(A) A fracture noted at the base of the first metatarsal is pathognomonic.
(B) Plantar ecchymosis may be an occult sign of injury.
(C) A gap of $<3 \mathrm{~mm}$ between the bases of the first and second metatarsals is considered normal.
(D) Most injuries require prolonged casting for up to 12 weeks.