One of the Buffers That Contributes to PH Stability in Human

Multiple Choice

One of the buffers that contributes to pH stability in human blood is carbonic acid (H2CO3) . Carbonic acid is a weak acid that dissociates into a bicarbonate ion (HCO3-) and a hydrogen ion (H+) . Thus, H2CO3 ↔ HCO3- + H+
If the pH of the blood drops, one would expect

A) a decrease in the concentration of H2CO3 and an increase in the concentration of HCO3-.
B) the concentration of hydroxide ion (OH-) to increase.
C) the concentration of bicarbonate ion (HCO3-) to increase.
D) the HCO3- to act as a base and remove excess H+ with the formation of H2CO3.
E) the HCO3- to act as an acid and remove excess H+ with the formation of H2CO3.