Which of the Following Statements Concerning HCO₃⁻ Excretion by the Kidneys

Multiple Choice

Which of the following statements concerning HCO₃⁻ excretion by the kidneys is incorrect?

A) During HCO3- reabsorption, HCO3- in the tubular fluid is actively cotransported by K+.
B) HCO3- is not excreted at pH =7.4.
C) Secretion of H+ is accompanied by the addition of new HCO3- to the plasma.
D) HCO3- excretion increases during alkalosis.
E) None of the above are incorrect.