Answer:
You didn't list any choices, but these are some common acids with their conjugate bases.
Explanation:
ACID CONJUGATE BASE
phosphoric acid dihydrogen phosphate ion
H₃PO₄ H₂PO₄⁻
acetic acid acetate ion
CH₃COOH CH₃COO⁻
hydrofluoric acid fluoride ion
HF F⁻
carbonic acid hydrogen carbonate ion
H₂CO₃ HCO₃⁻
hydrosulfuric acid hydrogen sulfide ion
H₂S HS⁻
