In the Reaction $\mathrm { HCl } + \mathrm { H } _ { 2 } \mathrm { Of } \quad \mathrm { H } _ { 3 } \mathrm { O } ^ { + } + \mathrm { Cl } ^ { - }$

Multiple Choice

In the reaction $\mathrm { HCl } + \mathrm { H } _ { 2 } \mathrm { Of } \quad \mathrm { H } _ { 3 } \mathrm { O } ^ { + } + \mathrm { Cl } ^ { - }$ , the number of conjugate acid-base pairs is ____.

A) zero
B) one
C) two
D) three
E) four