The Concentration of Oxalate Ion (C₂O₄^2-) in a Sample Can $\rarr$

The concentration of oxalate ion (C₂O₄^2-) in a sample can be determined by titration with a solution of permanganate ion (MnO₄^-) of known concentration. The net ionic equation for this reaction is 2MnO₄^- + 5C₂O₄^2- + 16H⁺ $\rarr$ 2Mn²⁺ + 8H₂O + 10CO₂
A 30.00 mL sample of an oxalate solution is found to react completely with 21.93 mL of a 0.1725 M solution of MnO₄^-. What is the oxalate ion concentration in the sample

A) 0.02914 M
B) 0.4312 M
C) 0.1821 M
D) 0.3152 M
E) 0.05044 M