A 45-Year-Old Woman Develops Severe Diarrhea While on Vacation $\mathrm{pH}=7.25$ $\mathrm{Pco}_{2}=24 \mathrm{~mm} \mathrm{Hg}$

A 45-year-old woman develops severe diarrhea while on vacation. She has the following arterial blood values:
$\mathrm{pH}=7.25$
$\mathrm{Pco}_{2}=24 \mathrm{~mm} \mathrm{Hg}$
$\left[\mathrm{HCO}_{3}^{-}\right]=10 \mathrm{mEq} / \mathrm{L}$
Venous blood samples show decreased blood $\left[\mathrm{K}^{+}\right]$ and a normal anion gap.
-Which of the following statements about this patient is correct?

A) She is hypoventilating
B) The decreased arterial $\left[\mathrm{HCO}_{3}^{-}\right]$ is a result of buffering of excess $\mathrm{H}^{+}$ by $\mathrm{HCO}_{3}^{-}$
C) The decreased blood $\left[\mathrm{K}^{+}\right]$ is a result of exchange of intracellular $\mathrm{H}^{+}$ for extracellular $\mathrm{K}^{+}$
D) The decreased blood $\left[\mathrm{K}^{+}\right]$ is a result of increased circulating levels of aldosterone
E) The decreased blood $\left[\mathrm{K}^{+}\right]$ is a result of decreased circulating levels of antidiuretic hormone (ADH)