What Is the Coefficient of H₂O When the Equation Below $\rarr$

Multiple Choice

What is the coefficient of H₂O when the equation below is properly balanced
___ PCl₃(l) + ___ H₂O(l) $\rarr$ ___ H₃PO₃(aq) + ___ HCl(aq)

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