A patient's GFR is 125 ml/min and his plasma glucose is 4 mg/ml. The patient's urine flow rate is 2 ml/min and the concentration of glucose in his urine is 60 mg/ml. Which of the following statements
A、The rate at which glucose is filtered at the glomerulus is 500 mg/min
B、The rate at which glucose is excreted is 120 mg/min
C、The net rate of tubular reabsorption of glucose is 380 mg/min
D、The highest plasma level for which all the filtered glucose could be reabsorbed is 2.5 mg/ml