A patient presents with primary adrenal insufficiency (Addison's disease). Which of the following electrolyte imbalances would you most likely expect to find due to impaired mineralocorticoid production?

✓ Correct Answer: Option B

In Addison's disease, impaired aldosterone production leads to decreased sodium reabsorption and increased potassium excretion in the renal tubules, resulting in hyponatremia and hyperkalemia.