The figure shows the human urinary system with structures labeled $A$ to $D$. Select the option which correctly identifies them and gives their characteristics and/or functions.

• A
  $A$: Adrenal gland - located at the anterior part of the kidney. It secretes catecholamines which stimulate glycogenolysis.
• B
  $B$: Pelvis - broad funnel-shaped space inner to the hilum,directly connected to the loops of Henle.
• C
  $C$: Medulla - inner zone of the kidney and contains complex nephrons.
• D
  $D$: Cortex - outer part of the kidney and does not contain any part of the nephrons.