Solve this:

Q. Identify the conjugate acids and bases in the following equation 

                     NH₃ + H₂O $\underset{}{\rightleftharpoons }$ ${\mathrm{H}}_4^{+}$ + OH¯

       A (H₂O, OH¯ ) and ( N${\mathrm{H}}_2^{+}$ , NH₃ )

       B  (H₂O, OH¯ ) and (N${\mathrm{H}}_4^{+}$ , NH${\mathrm{H}}_2^{2¯}$)

       C  (H₂O,OH ) and (NH₃, NH₄)

       D  ( H₂O₄,OH¯) and (N${\mathrm{H}}_4^{+}$ , NH₃)