In a Solution Prepared by Mixing Equal Volumes of 0

In a solution prepared by mixing equal volumes of 0.20 M aqueous acetic acid and 0.20 M aqueous hydrobromic acid,the common ion is ________.

A) Br^-
B) C₂H₃O₂^2-
C) H₂C₂H₃O₂
D) H₂Br⁺
E) H₃O⁺