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PLEASE HELP!! GIVING 15 POINTS!

Carbonic acid (H2CO3) serves as a buffer in human blood. Carbonic acid is a weak acid that dissociates into a bicarbonate ion (HCO3-) and a hydrogen ion (H+). Thus, H2CO3 <--> HCO3- + H+. A decrease in blood pH will result in

A) a decrease in the concentration of H2CO3 and an increase in the concentration of HCO3-.
B) a decrease in the concentrations of H2CO3 and HCO3-.
C) an increase in the concentration of H2CO3 and a decrease in the concentration of HCO3-.
D) an increase in the concentration of H2CO3 and HCO3-.
E) an increase in the concentrations of H2CO3, HCO3-, and OH-.