The Following Unbalanced Equation Represents a Reaction That Occurs in Basic

The following unbalanced equation represents a reaction that occurs in basic solution: MnO₄^2- + C₂O₄^2- $\to$ MnO₂ + CO₃^2-
How many moles of MnO₄^2- are required to produce 1 mole of CO₃^2-?

A) 4
B) 3
C) 2
D) 1
E) none of these