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Conjugate Acid-Base Pairs

APCHEM-OG4MI6

What are the conjugate acid-base pairs in the following reaction?

$$H_3PO_{4 (aq)} + H_2O_{(l)}\rightarrow H_2{PO}^{-}_{4 (aq)} + H_3{O}^{+}_{(aq)}$$

A

$H_3PO_{4 (aq)}/ H_2O_{(l)}$

B

$H_{3}PO_{4 (aq)}/ H_{2}{PO}^{-}_{4 (aq)}$

C

$H_2O_{(l)}/ H_2{PO}^{-}_{4 (aq)}$

D

$H_2O_{(l)}/ H_2O_{(l)}$