When a diabetic patient asks about maintaining adequate blood glucose levels, which of the following ...

When a diabetic patient asks about maintaining adequate blood glucose levels, which of the following statements by the nurse relates most directly to the necessity of maintaining blood glucose levels no lower than about 74 mg/dL?
 
  a. Glucose is the only type of fuel used by body cells to produce the energy needed for physiologic activity.
  b. The central nervous system cannot store glucose and needs a continuous supply of glucose for fuel.
  c. Without a minimum level of glucose circulating in the blood, erythrocytes cannot produce ATP.
  d. The presence of glucose in the blood counteracts the formation of lactic acid and prevents acidosis.