While Assessing the Feet of a 72-Year-Old Male Patient with Diabetes

While assessing the feet of a 72-year-old male patient with diabetes, the nurse noted that there were no cuts, cracks, or blisters. The patient stated, "I don't have as much feeling in my feet as I used to." The nurse correctly understands that the patient is most likely suffering from

A) Paresthesia.
B) Infection.
C) Lentigines.
D) Necrosis.