-At which site is the tubular fluid $\left[\mathrm{HCO}_{3}{ }^{-}\right]$ highest?

Question

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[Chapter 5, IX C 1 a]. $\mathrm{HCO}_{3}^{-}$is filtered and then extensively reabsorbed in the early proximal tubule. Because this reabsorption exceeds that for $\mathrm{H}_{2} \mathrm{O}$, the $\left[\mathrm{HCO}_{3}^{-}\right]$of proximal tubular fluid decreases. Therefore, the highest concentration of $\left[\mathrm{HCO}_{3}^{-}\right]$is found in the glomerular filtrate.

-At Which Site Is the Tubular Fluid [HCO3−]\left[\mathrm{HCO}_{3}{ }^{-}\right][HCO3​−] Highest? A) Site a B) Site B C) Site C

-At Which Site Is the Tubular Fluid $\left[\mathrm{HCO}_{3}{ }^{-}\right]$ Highest?
A) Site a
B) Site B
C) Site C