Samantha's blood tests indicate she is suffering from anemia. Based on the background information described in this case, identify the likely reason for this clinical finding.

a. Dysfunctional kidneys produce inadequate amounts of erythropoietin, which is needed to stimulate red blood cell production by the bone marrow.

b. Since the physician suspects neglect is complicating Sam's condition, poor nutrition could be responsible for low iron levels.

c. Poor diet due to neglect may result in folic acid and vitamin B12 deficiencies, which hinder red blood cell production.

d. All of the above factors may be responsible for Sam's anemia.