What is the effect of countercurrent multiplier in the loop of Henle?
Solutes (ions) are most concentrated as filtrate leaves the loop of Henle.
Water is reabsorbed in the descending loop of Henle.
The filtrate becomes progressively more hyposmotic as it descends the loop.
The filtrate is least concentrated at the deepest part of the loop of Henle.

The correct answer is "Water is reabsorbed in the descending loop of Henle".

Explanation:

The loop of Henle is a structure of the body located at the kidneys that conducts urine within each nephron. The effect of countercurrent multiplier in the loop of Henle is that water is reabsorbed in its descending part. The body reacts to the countercurrent multiplier by increasing water  permeability in the late distal tubule and collecting ducts of the renal tubules.

Water is reabsorbed in the descending loop of Henle.

Explanation:

The descending loop of Henle accepts about 300m 0sm/L of isotonic liquid from the proximal convoluted tubule. This part of the loop of Henle as high permeability for water but less permeability for ions, meaning that it allows water to pass through it easily. This means that water can easily be reabsorbed at the descending loop of Henle, but solutes can not.

not only is it colder, it also becomes darker, less salty, and more dense.