if one says that the clearance value of glucose is zero, what does this mean?

If one says that the clearance value of glucose is zero, what does this mean?

A) The glucose molecule is too large to be filtered out of the blood.

B) Most of the glucose is filtered out of the blood and is not reabsorbed in the convoluted tubules.

C) Normally all the glucose is reabsorbed.

D) The clearance value of glucose is relatively high in a healthy adult.