Which Statement About the Kidneys' Role in Acid-Base Balance Is

Which statement about the kidneys' role in acid-base balance is false?

A) Bicarbonate and sodium ions enter the nephron during glomerular filtration.
B) Cells of the renal tubule secrete hydrogen ions in exchange for sodium ions.
C) Renal tubule cells contain the enzyme carbonic anhydrase.
D) A symporter carries sodium and bicarbonate ions from the renal tubule cell into the interstitial fluid.
E) Whereas the kidneys control levels of CO₂ in the blood, the lungs control levels of H⁺ in the blood.