Balance the Following Redox Reaction Under Basic Aqueous Conditions Using $\to$

Balance the following redox reaction under basic aqueous conditions using the smallest whole-number coefficients possible.What is the coefficient of OCl^-? OCl^-(aq) + Cr³⁺(aq) $\to$ Cl^-(aq) + Cr₂O₇^2-(aq)

A) 2
B) 3
C) 6
D) 10
E) 12