The correct option is C cortex
The two primary regions of the kidney are the cortex and the medulla. Nephrons that are present in kidney are the functional units of the kidney. It is made up of 2 units - the Bowman's capsule or the renal corpuscle and the renal tubule. The Bowman’s capsule is found in the cortex region of the kidney. So the nephrons begins in the cortex and the renal tubules extend into the medulla of the kidneys.
Henle’s loop is a u-shaped tubule and is a part of nephron that helps to absorb the water and sodium chloride from the urine.