Hi Heather and Andrea,
Thank you for this question! The most important management for diabetic ulcers is offloading to allow for wound healing. This still applies even with wounds on the dorsal foot. You are correct that plantar ulcers are the classic indication for total contact casts, but they are still indicated for dorsal ulcers. The main goal of the therapist is offloading and promotion of healing.
Why B is incorrect: shoes are only a preventative measure, not a treatment
Why C is incorrect: weight bearing would increase shear forces
Why D is incorrect: partial weight bearing is not enough offloading
Remember that the exam will make you choose the BEST answer. You got this!
-Jonathan