Blood consists of plasma and blood cells. Due to the filtration of glomerulus, macromolecules such as protein and blood cells are not filtered, and other small molecules are filtered into the renal capsule cavity to form urine. When urine passes through renal tubules, all glucose, most water and some inorganic salts in urine are reabsorbed into blood by renal tubules through reabsorption, and the remaining water, inorganic salts and urea form urine. The components of these three substances are as follows.
It is obvious from the table that some substances of the three are: water, inorganic salts and urea.
Therefore, the same substances contained in renal afferent arteriole, renal capsule cavity and renal tubular end are water, inorganic salts and urea.
So choose C.