19. Bicarbonate crosses the apical membrane of the proximal tubule by
(A) $$\text{HCO}_3^- / \text{Cl}^-$$ countertransporters.
(B) $$\text{Na}^+/\text{HCO}_3^-$$ cotransporters.
(C) conversion to carbon dioxide.
(D) $$\text{HCO}_3^-$$ active transporters.
(E) $$\text{Na}^+/\text{HCO}_3^-$$ countertransporters.

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