Given the Following Reaction in Acidic Media: Fe²⁺ + Cr₂O₇^2- $\to$

Given the following reaction in acidic media: Fe²⁺ + Cr₂O₇^2- $\to$ Fe³⁺ + Cr³⁺
Answer the following question: The coefficient for water in the balanced reaction is:

A) 1
B) 3
C) 5
D) 7
E) none of these