Why Is It More Practical to Measure the Concentration of CO₂

Why is it more practical to measure the concentration of CO₂ than that of H₂CO₃ when analyzing the blood buffering system?

A) H₂CO₃ emits toxic fumes which makes it dangerous to work with regularly in the laboratory.
B) In the blood, H₂CO₃ is bound to a carrier molecule that obscures its detection.
C) The concentration of H₂CO₃ in the blood is negligibly small.
D) Both A and C are correct.

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