No Matter How Much Water a Human Drinks,the Kidneys Are

No matter how much water a human drinks,the kidneys are always regulating various aspects of the blood,including ________.
I-the pH of the blood
II-the plasma concentration of iron ions
III-the plasma concentration of sodium ions
IV-the plasma concentration of potassium ions
V-the temperature of the blood

A) I,II,and III
B) I,II,III,and IV
C) I,III,and IV
D) I,III,IV,and V
E) I,II,III,IV,and V