Apatient complains of thirst, blurry vision, numb hands, and frequent urination. which statement best explains why a doctor performed a blood glucose test on this patient? (a blood glucose test tests for levels of sugar in the blood.)

a. the patient might have multiple sclerosis.
b. the patient might have sickle cell anemia.
c. the patient might have serious vision problems.
d. the patient might have diabetes.