The correct option is D A- Bowman's capsule: 2
B- Proximal convoluted tubule: 3
C- Loop of Henle: 1
Nephron is the functional unit of kidney and helps in urine production. All the parts asked in the question are parts of nephron.
∙ Pressure filtration or ultrafiltration happens in glomerulus present within Bowman's capsule (A). Waste materials, nutrients and water is filtered out from the blood. This filterate is called primary urine.
∙ Proximal convoluted tubule (PCT) (B) is responsible for reabsorption of useful materials like vitamins, glucose, amino acids, potassium, calcium and water from the primary urine.
∙ Loop of Henle helps in maintaining the concentration of urine by reabsorbing the water and salts from it.