The levels of water and salt in the blood are controlled by what

Kidneys

Explanation:

These organs excrete  excess water and salts in the blood and also conserves them when they are in low concentrations. The rate of reabsorption is controlled by ADH (Anti-diuretic hormone/vasopressin) and ACTH (that triggers the release of aldosterone by adrenal glands) that are produced by the pituitary gland.

c. is the correct answer

answer; ///the above statement is (true);