A Solution of Potassium Permanganate Was Standardized by Titration of a Solution

Multiple Choice

A solution of potassium permanganate was standardized by titration of a solution prepared by dissolving 0.268 g of pure sodium oxalate in approximately 25 mL of distilled water. A 31.4 mL volume of titrant was required to reach the end-point. The reaction is: 2 MnO₄^- + 5 C₂O₄^2- + 16 H⁺ → 2 Mn²⁺ + 10 CO₂ + 8 H₂O.
What is the molarity of MnO₄^- ?

A) 0.0174 M
B) 0.0255 M
C) 0.0348 M
D) 0.0637 M
E) 0.159 M