Final answer:
The earliest sign of any electrolyte disorder is excessive thirst.
Step-by-step explanation:
The earliest sign of any electrolyte disorder is excessive thirst (D).
Electrolytes are minerals in the body that have an electric charge and help maintain fluid balance. When there is an imbalance of electrolytes, it can affect various bodily functions. Increased thirst is often one of the first symptoms because the body is trying to compensate for the loss of fluids and electrolytes.