When Would the PH of a Solution Prepared by Adding

Multiple Choice

When would the pH of a solution prepared by adding sodium formate to formic acid be equal to the pK_a of formic acid, HCO₂H?

A) when [HCO₂H] < [HCO₂^-]
B) when [HCO₂H] = [HCO₂^-]
C) when [HCO₂H] > [HCO₂^-]
D) The pH of this buffer will never equal the pK_a of formic acid.
E) When the temperature is 25°C.