Balance the Equation Below Using the Smallest Set of Whole $\rarr$

Multiple Choice

Balance the equation below using the smallest set of whole numbers. What is the coefficient of H₂O?
___ PCl₃(l) + ___ H₂O(l) $\rarr$ ___ H₃PO₃(aq) + ___ HCl(aq)

A) 1
B) 2
C) 3
D) 5
E) none of these