The nephrons discharge their urine at the which part of our kidneys?

• The excretory system eliminates metabolic wastes from the body, including nitrogenous waste, in humans. 
• A pair of kidneys, renal arteries and veins, ureters, the urine bladder, and the urethra make up its small number of components.
• Renal Hilum is a region where kidney opens into the urethra.
  The renal cortex, renal medulla, and renal pelvis are all located vertically within the kidney.
• Funnel-like structure in the kidney where 2 or 3 main calyces meet together is called the renal pelvis.

Hence, the correct answer is option (C).