In the Equation, CrO₄^2-(aq) + H₂O(l) $\rarr$ CrO₂^-(aq)+ OH^-(aq), the Change in the Oxidation Number of the Change

Multiple Choice

In the equation, CrO₄^2-(aq) + H₂O(l) $\rarr$ CrO₂^-(aq) + OH^-(aq) , the change in the oxidation number of the chromium atom is

A) decrease by six units.
B) decrease by three units.
C) increase by three units.
D) increase by five units.
E) increase by eight units.