A healthy individual,weighing 60 kg,receives an infusion of 1 L of isotonic saline to which 20 mEq of K+ has been added.After the infusion,the plasma [K+] of this individual has increased from 3.5 mEq/L to 7.8 mEq/L.What is the most plausible explanation for the development of hyperkalemia in this individual?
A)K+ shifts from the intracellular fluid (ICF)into the extracellular fluid (ECF). B)Renal excretion of K+ is impaired. C)The increase in plasma [K+] of 4.3 mEq/L is what is expected from the addition of 20 mEq/L of K+ to the ECF. D)The ECF volume contracts. E)Hyperosmolality develops.