In Which One of the Following Solutions Will Acetic Acid

In which one of the following solutions will acetic acid have the greatest percent ionization

A) 0.1 M CH₃COOH
B) 0.1 M CH₃COOH dissolved in 0.1 M HCl
C) 0.1 M CH₃COOH dissolved in 0.2 M HCl
D) 0.1 M CH₃COOH plus 0.1 M CH₃COONa
E) 0.1 M CH₃COOH plus 0.2 M CH₃COONa