In Basic Solution the Chromate Ion,CrO₄^2-,can Be Converted to the Chromite,CrO₂^-,ion.The

In basic solution the chromate ion,CrO₄^2-,can be converted to the chromite,CrO₂^-,ion.The number of electrons gained or lost by the chromium atom is

A) 0.
B) 3 electrons lost.
C) 2 electrons lost.
D) 3 electrons gained.
E) 2 electrons gained.