option C is wrong

Which of the following buffer solutions has the largest buffer capacity? A) A buffer made by mixing 40.00 mL of 0.25 M NaClO2 and 50.00 mL of 0.20 M HCIO. B) A buffer made by mixing 58.33 mL of 0.12 M NaF and 50.00 mL of 0.14 M HF. C) A buffer made by mixing 75.00 mL of 0.10 M Nalo and 75.00 mL of 0.10 M HIO. D) A buffer made by mixing 80.00 mL of 0.15 M CHCOONa and 60.00 mL of 0.20 M CH3COOH