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Which of the following solutions is a good buffer system? A) A solution that is 0.10 M NaOH and 0.10 M KOH B) A solution that is 0.10 M HF and 0.10 M NaC2H3O2 C) A solution that is 0.10 M HC2H3O2 and 0.10 M LiC2H3O2 D) A solution that is 0.10 M HCl and 0.10 M NH4+ E) None of the above are buffer systems.