Altius Test 1 Question 7 Section 1

Can anyone explain to me why A is correct??

Hyperventilation occurs in response to respiratory acidosis because hyperventilation:
A) increases blood pH by decreasing CO2 concentrations
B) increases blood pH by decreasing HCO3- concentrations
C) decreases blood pH by decreasing CO2 concentrations
D) decreases blood pH by decreasing HCO3- concentrations

I thought the answer was B ://

This equation was given in the passage:

CO2 + H2O <----> H2CO3 <-----> HCO3- + H+