The correct option is D Proximal convoluted tubule
Tubular reabsorption is the process that moves solutes and water out of the filtrate and back into your bloodstream.
Glucose, amino acids, Na+, etc., in the filtrate are reabsorbed actively. Most of the solute reabsorbed in the proximal tubule is in the form of sodium bicarbonate and sodium chloride, and about 70% of the sodium reabsorption occurs here.