Blood plasma contains proteins but glomerular filtrate does not. Why does this difference in composition occur?

• A. Blood osmotic pressure is maintained by the presence of plasma proteins.
• B. Proteins are actively transported from the kidney tubule back into the blood capillaries.
• C. Proteins cannot pass through the membranes of the glomerular capillaries.
• D. There is a high hydrostatic pressure in the blood within the glomerular capillaries.