During a discussion of RBC indices, a medical technologist of Cambodian origin mentioned that her ...

During a discussion of RBC indices, a medical technologist of Cambodian origin mentioned that her own red cells had been small in a CBC performed 2 years earlier in a routine physical. A more recent CBC showed the following results.
 
  TEST RESULTS
  WBC 9.3 x 109/L
  RBC 6.11 x 1012/L
  HGB 13.0 g/dL
  HCT 41.8
  MCV 69.6 fL
  MCH 22.5 pg
  MCHC 31.0 g/dL
  RDW 15.8
  PLT 351 x 109/L
  Differential Within normal limits
 
  Based on the demographics of this patient, what disorder is suspected?
  a. Sickle cell disease
  b. Hemoglobin C disease
  c. Hemoglobin SC disease
  d. Hemoglobin E disease