Which of the Following Yields a Buffer Solution When Equal

Multiple Choice

Which of the following yields a buffer solution when equal volumes of the two solutions are mixed

A) 0.10M H₂CO₃ and 0.050M HCl
B) 0.10M H₂CO₃ and 0.10M KOH
C) 0.10M H₂CO₃ and 0.10M HCl
D) 0.10M H₂CO₃ and 0.050M KOH
E) 0.10M K₂CO₃ and 0.050M KOH