Concept:Selective reabsorption is the return of useful substances, such as water, salts, and glucose, from the kidney filtrate back into the blood.
Explanation:The glomerulus and Bowman's capsule filter blood to form the filtrate.
They are not the main sites where useful substances are selectively reabsorbed.
The loop of Henle reabsorbs water and salts from the filtrate, so it is part of the selective reabsorption process in the nephron.
The urethra only carries urine out of the body and does not perform reabsorption.
Among the options given, the loop of Henle is the part of the nephron involved in selective reabsorption.
Answer:C. Henle's loop