Balance the Half-Reaction in Acidic Solution and Determine the Coefficient

Multiple Choice

Balance the half-reaction in acidic solution and determine the coefficient for hydrogen ion:
___ Cr³⁺ + ___ H₂O ___ Cr₂O₇^2- + ___ H⁺

A) 2
B) 5
C) 8
D) 11
E) 14