For the Equation , If the Final Concentrations of [H⁺], [CH₃CO₂^?], and [CH₃CO₂H]

For the equation $\mathrm { CH } _ { 3 } \mathrm { CO } _ { 2 } ( \mathrm { aq } ) f \mathrm { H } ^ { + } ( \mathrm { aq } ) + \mathrm { CH } _ { 3 } \mathrm { CO } _ { 2 } ^ { - } ( \mathrm { aq } )$ , if the final concentrations of [H⁺], [CH₃CO₂^?], and [CH₃CO₂H] are 0.0014M, 0.0036M, and 1.00M respectively the value of pK_a is _____.

A) 2.7
B) 3.2
C) 6.8
D) 4.6
E) 5.3